16165680087457 has 2 divisors, whose sum is σ = 16165680087458. Its totient is φ = 16165680087456.

The previous prime is 16165680087409. The next prime is 16165680087523. The reversal of 16165680087457 is 75478008656161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15397140318561 + 768539768896 = 3923919^2 + 876664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16165680087457 is a prime.

It is a super-2 number, since 2×16165680087457² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16165680087757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082840043728 + 8082840043729.

It is an arithmetic number, because the mean of its divisors is an integer number (8082840043729).

Almost surely, 2^{16165680087457} is an apocalyptic number.

It is an amenable number.

16165680087457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16165680087457 is an equidigital number, since it uses as much as digits as its factorization.

16165680087457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67737600, while the sum is 64.

The spelling of 16165680087457 in words is "sixteen trillion, one hundred sixty-five billion, six hundred eighty million, eighty-seven thousand, four hundred fifty-seven".