15163856881 has 2 divisors, whose sum is σ = 15163856882. Its totient is φ = 15163856880.

The previous prime is 15163856867. The next prime is 15163856887. The reversal of 15163856881 is 18865836151.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8567168481 + 6596688400 = 92559^2 + 81220^2 .

It is a cyclic number.

It is not a de Polignac number, because 15163856881 - 2⁵ = 15163856849 is a prime.

It is a super-2 number, since 2×15163856881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15163856887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7581928440 + 7581928441.

It is an arithmetic number, because the mean of its divisors is an integer number (7581928441).

Almost surely, 2^15163856881 is an apocalyptic number.

It is an amenable number.

15163856881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15163856881 is an equidigital number, since it uses as much as digits as its factorization.

15163856881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 52.

The spelling of 15163856881 in words is "fifteen billion, one hundred sixty-three million, eight hundred fifty-six thousand, eight hundred eighty-one".