15156161660581 has 2 divisors, whose sum is σ = 15156161660582. Its totient is φ = 15156161660580.

The previous prime is 15156161660579. The next prime is 15156161660617. The reversal of 15156161660581 is 18506616165151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10030148695681 + 5126012964900 = 3167041^2 + 2264070^2 .

It is a cyclic number.

It is not a de Polignac number, because 15156161660581 - 2¹ = 15156161660579 is a prime.

It is a super-2 number, since 2×15156161660581² (a number of 27 digits) contains 22 as substring.

Together with 15156161660579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15157161660581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7578080830290 + 7578080830291.

It is an arithmetic number, because the mean of its divisors is an integer number (7578080830291).

Almost surely, 2^{15156161660581} is an apocalyptic number.

It is an amenable number.

15156161660581 is a deficient number, since it is larger than the sum of its proper divisors (1).

15156161660581 is an equidigital number, since it uses as much as digits as its factorization.

15156161660581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 52.

The spelling of 15156161660581 in words is "fifteen trillion, one hundred fifty-six billion, one hundred sixty-one million, six hundred sixty thousand, five hundred eighty-one".