165930939540857 has 2 divisors, whose sum is σ = 165930939540858. Its totient is φ = 165930939540856.

The previous prime is 165930939540853. The next prime is 165930939540973. The reversal of 165930939540857 is 758045939039561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157404399380281 + 8526540160576 = 12546091^2 + 2920024^2 .

It is a cyclic number.

It is not a de Polignac number, because 165930939540857 - 2² = 165930939540853 is a prime.

It is not a weakly prime, because it can be changed into another prime (165930939540853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82965469770428 + 82965469770429.

It is an arithmetic number, because the mean of its divisors is an integer number (82965469770429).

Almost surely, 2^{165930939540857} is an apocalyptic number.

It is an amenable number.

165930939540857 is a deficient number, since it is larger than the sum of its proper divisors (1).

165930939540857 is an equidigital number, since it uses as much as digits as its factorization.

165930939540857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248000, while the sum is 74.

The spelling of 165930939540857 in words is "one hundred sixty-five trillion, nine hundred thirty billion, nine hundred thirty-nine million, five hundred forty thousand, eight hundred fifty-seven".