18969378624 has 252 divisors, whose sum is σ = 63682583328. Its totient is φ = 5382720000.

The previous prime is 18969378563. The next prime is 18969378629. The reversal of 18969378624 is 42687396981.

18969378624 is a `hidden beast` number, since 189 + 69 + 378 + 6 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18969378629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4259599 + ... + 4264049.

It is an arithmetic number, because the mean of its divisors is an integer number (252708664).

Almost surely, 2^18969378624 is an apocalyptic number.

18969378624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18969378624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31841291664).

18969378624 is an abundant number, since it is smaller than the sum of its proper divisors (44713204704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18969378624 is a wasteful number, since it uses less digits than its factorization.

18969378624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4634 (or 4614 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 18969378624 in words is "eighteen billion, nine hundred sixty-nine million, three hundred seventy-eight thousand, six hundred twenty-four".