15788564081 has 2 divisors, whose sum is σ = 15788564082. Its totient is φ = 15788564080.

The previous prime is 15788564063. The next prime is 15788564119. The reversal of 15788564081 is 18046588751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15672786481 + 115777600 = 125191^2 + 10760^2 .

It is a cyclic number.

It is not a de Polignac number, because 15788564081 - 2¹⁸ = 15788301937 is a prime.

It is a super-2 number, since 2×15788564081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15788564021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7894282040 + 7894282041.

It is an arithmetic number, because the mean of its divisors is an integer number (7894282041).

Almost surely, 2^15788564081 is an apocalyptic number.

It is an amenable number.

15788564081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15788564081 is an equidigital number, since it uses as much as digits as its factorization.

15788564081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2150400, while the sum is 53.

The spelling of 15788564081 in words is "fifteen billion, seven hundred eighty-eight million, five hundred sixty-four thousand, eighty-one".