18235961440 has 48 divisors (see below), whose sum is σ = 43094576448. Its totient is φ = 7292333056.

The previous prime is 18235961399. The next prime is 18235961449. The reversal of 18235961440 is 4416953281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18235961449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637689 + ... + 665671.

It is an arithmetic number, because the mean of its divisors is an integer number (897803676).

Almost surely, 2^18235961440 is an apocalyptic number.

18235961440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18235961440 is an abundant number, since it is smaller than the sum of its proper divisors (24858615008).

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

18235961440 is a wasteful number, since it uses less digits than its factorization.

18235961440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32071 (or 32063 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 18235961440 in words is "eighteen billion, two hundred thirty-five million, nine hundred sixty-one thousand, four hundred forty".