166390134577 has 2 divisors, whose sum is σ = 166390134578. Its totient is φ = 166390134576.

The previous prime is 166390134551. The next prime is 166390134583. The reversal of 166390134577 is 775431093661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132135158016 + 34254976561 = 363504^2 + 185081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166390134577 is a prime.

It is not a weakly prime, because it can be changed into another prime (166390134527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83195067288 + 83195067289.

It is an arithmetic number, because the mean of its divisors is an integer number (83195067289).

Almost surely, 2^166390134577 is an apocalyptic number.

It is an amenable number.

166390134577 is a deficient number, since it is larger than the sum of its proper divisors (1).

166390134577 is an equidigital number, since it uses as much as digits as its factorization.

166390134577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 166390134577 in words is "one hundred sixty-six billion, three hundred ninety million, one hundred thirty-four thousand, five hundred seventy-seven".