164216677637 has 2 divisors, whose sum is σ = 164216677638. Its totient is φ = 164216677636.

The previous prime is 164216677609. The next prime is 164216677643. The reversal of 164216677637 is 736776612461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146546558596 + 17670119041 = 382814^2 + 132929^2 .

It is a cyclic number.

It is not a de Polignac number, because 164216677637 - 2²⁸ = 163948242181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164216607637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82108338818 + 82108338819.

It is an arithmetic number, because the mean of its divisors is an integer number (82108338819).

Almost surely, 2^164216677637 is an apocalyptic number.

It is an amenable number.

164216677637 is a deficient number, since it is larger than the sum of its proper divisors (1).

164216677637 is an equidigital number, since it uses as much as digits as its factorization.

164216677637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 56.

The spelling of 164216677637 in words is "one hundred sixty-four billion, two hundred sixteen million, six hundred seventy-seven thousand, six hundred thirty-seven".