19418449464 has 240 divisors, whose sum is σ = 58683378600. Its totient is φ = 5982512256.

The previous prime is 19418449451. The next prime is 19418449469. The reversal of 19418449464 is 46494481491.

19418449464 is a `hidden beast` number, since 1 + 94 + 1 + 8 + 4 + 494 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a self number, because there is not a number n which added to its sum of digits gives 19418449464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19418449469) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 22764462 + ... + 22765314.

Almost surely, 2^19418449464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19418449464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29341689300).

19418449464 is an abundant number, since it is smaller than the sum of its proper divisors (39264929136).

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

19418449464 is a wasteful number, since it uses less digits than its factorization.

19418449464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 920 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 19418449464 in words is "nineteen billion, four hundred eighteen million, four hundred forty-nine thousand, four hundred sixty-four".