164521774457 has 2 divisors, whose sum is σ = 164521774458. Its totient is φ = 164521774456.

The previous prime is 164521774451. The next prime is 164521774493. The reversal of 164521774457 is 754477125461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93672111481 + 70849662976 = 306059^2 + 266176^2 .

It is a cyclic number.

It is not a de Polignac number, because 164521774457 - 2²² = 164517580153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164521774399 and 164521774408.

It is not a weakly prime, because it can be changed into another prime (164521774451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82260887228 + 82260887229.

It is an arithmetic number, because the mean of its divisors is an integer number (82260887229).

Almost surely, 2^164521774457 is an apocalyptic number.

It is an amenable number.

164521774457 is a deficient number, since it is larger than the sum of its proper divisors (1).

164521774457 is an equidigital number, since it uses as much as digits as its factorization.

164521774457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6585600, while the sum is 53.

The spelling of 164521774457 in words is "one hundred sixty-four billion, five hundred twenty-one million, seven hundred seventy-four thousand, four hundred fifty-seven".