18311854520 has 16 divisors (see below), whose sum is σ = 41201672760. Its totient is φ = 7324741792.

The previous prime is 18311854493. The next prime is 18311854529. The reversal of 18311854520 is 2545811381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311854529) 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 3 ways as a sum of consecutive naturals, for example, 228898142 + ... + 228898221.

Almost surely, 2^18311854520 is an apocalyptic number.

18311854520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18311854520 is an abundant number, since it is smaller than the sum of its proper divisors (22889818240).

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

18311854520 is a wasteful number, since it uses less digits than its factorization.

18311854520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457796374 (or 457796370 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 18311854520 in words is "eighteen billion, three hundred eleven million, eight hundred fifty-four thousand, five hundred twenty".