18504056551 has 8 divisors (see below), whose sum is σ = 18762282000. Its totient is φ = 18247618560.

The previous prime is 18504056533. The next prime is 18504056621. The reversal of 18504056551 is 15565040581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18504056551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18504056251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426010 + ... + 467431.

It is an arithmetic number, because the mean of its divisors is an integer number (2345285250).

Almost surely, 2^18504056551 is an apocalyptic number.

18504056551 is a deficient number, since it is larger than the sum of its proper divisors (258225449).

18504056551 is a wasteful number, since it uses less digits than its factorization.

18504056551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893729.

The product of its (nonzero) digits is 120000, while the sum is 40.

The spelling of 18504056551 in words is "eighteen billion, five hundred four million, fifty-six thousand, five hundred fifty-one".