20616165377 has 2 divisors, whose sum is σ = 20616165378. Its totient is φ = 20616165376.

The previous prime is 20616165347. The next prime is 20616165389. The reversal of 20616165377 is 77356161602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19846047376 + 770118001 = 140876^2 + 27751^2 .

It is a cyclic number.

It is not a de Polignac number, because 20616165377 - 2⁶ = 20616165313 is a prime.

It is not a weakly prime, because it can be changed into another prime (20616165307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308082688 + 10308082689.

It is an arithmetic number, because the mean of its divisors is an integer number (10308082689).

Almost surely, 2^20616165377 is an apocalyptic number.

It is an amenable number.

20616165377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616165377 is an equidigital number, since it uses as much as digits as its factorization.

20616165377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 20616165377 in words is "twenty billion, six hundred sixteen million, one hundred sixty-five thousand, three hundred seventy-seven".