18164875164521 has 4 divisors (see below), whose sum is σ = 18165017995344. Its totient is φ = 18164732333700.

The previous prime is 18164875164497. The next prime is 18164875164533. The reversal of 18164875164521 is 12546157846181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18164875164521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18164875164571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71224475 + ... + 71479056.

It is an arithmetic number, because the mean of its divisors is an integer number (4541254498836).

Almost surely, 2^{18164875164521} is an apocalyptic number.

It is an amenable number.

18164875164521 is a deficient number, since it is larger than the sum of its proper divisors (142830823).

18164875164521 is a wasteful number, since it uses less digits than its factorization.

18164875164521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142830822.

The product of its digits is 12902400, while the sum is 59.

The spelling of 18164875164521 in words is "eighteen trillion, one hundred sixty-four billion, eight hundred seventy-five million, one hundred sixty-four thousand, five hundred twenty-one".