18319056537 has 32 divisors (see below), whose sum is σ = 27644924160. Its totient is φ = 10726369280.

The previous prime is 18319056533. The next prime is 18319056557. The reversal of 18319056537 is 73565091381.

It is a cyclic number.

It is not a de Polignac number, because 18319056537 - 2² = 18319056533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18319056533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142362 + ... + 238547.

It is an arithmetic number, because the mean of its divisors is an integer number (863903880).

Almost surely, 2^18319056537 is an apocalyptic number.

18319056537 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18319056537 is a deficient number, since it is larger than the sum of its proper divisors (9325867623).

18319056537 is a wasteful number, since it uses less digits than its factorization.

18319056537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380993.

The product of its (nonzero) digits is 680400, while the sum is 48.

The spelling of 18319056537 in words is "eighteen billion, three hundred nineteen million, fifty-six thousand, five hundred thirty-seven".