15585392881 has 2 divisors, whose sum is σ = 15585392882. Its totient is φ = 15585392880.

The previous prime is 15585392869. The next prime is 15585392897. The reversal of 15585392881 is 18829358551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12135005281 + 3450387600 = 110159^2 + 58740^2 .

It is an emirp because it is prime and its reverse (18829358551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15585392881 is a prime.

It is a super-2 number, since 2×15585392881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15585392681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7792696440 + 7792696441.

It is an arithmetic number, because the mean of its divisors is an integer number (7792696441).

Almost surely, 2^15585392881 is an apocalyptic number.

It is an amenable number.

15585392881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15585392881 is an equidigital number, since it uses as much as digits as its factorization.

15585392881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 55.

The spelling of 15585392881 in words is "fifteen billion, five hundred eighty-five million, three hundred ninety-two thousand, eight hundred eighty-one".