18231776640 has 1152 divisors, whose sum is σ = 82027632960. Its totient is φ = 3649536000.

The previous prime is 18231776593. The next prime is 18231776671. The reversal of 18231776640 is 4667713281.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 180512590 + ... + 180512690.

Almost surely, 2^18231776640 is an apocalyptic number.

18231776640 is a gapful number since it is divisible by the number (10) 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 18231776640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41013816480).

18231776640 is an abundant number, since it is smaller than the sum of its proper divisors (63795856320).

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

18231776640 is a wasteful number, since it uses less digits than its factorization.

18231776640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 18231776640 in words is "eighteen billion, two hundred thirty-one million, seven hundred seventy-six thousand, six hundred forty".