15587992081 has 2 divisors, whose sum is σ = 15587992082. Its totient is φ = 15587992080.

The previous prime is 15587992073. The next prime is 15587992111. The reversal of 15587992081 is 18029978551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11747091456 + 3840900625 = 108384^2 + 61975^2 .

It is a cyclic number.

It is not a de Polignac number, because 15587992081 - 2³ = 15587992073 is a prime.

It is a super-2 number, since 2×15587992081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15587992031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7793996040 + 7793996041.

It is an arithmetic number, because the mean of its divisors is an integer number (7793996041).

Almost surely, 2^15587992081 is an apocalyptic number.

It is an amenable number.

15587992081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15587992081 is an equidigital number, since it uses as much as digits as its factorization.

15587992081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 55.

The spelling of 15587992081 in words is "fifteen billion, five hundred eighty-seven million, nine hundred ninety-two thousand, eighty-one".