15956489761 has 9 divisors (see below), whose sum is σ = 16239107443. Its totient is φ = 15678714280.

The previous prime is 15956489753. The next prime is 15956489851. The reversal of 15956489761 is 16798465951.

The square root of 15956489761 is 126319.

It is a perfect power (a square), and thus also a powerful number.

15956489761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 15219910161 + 736579600 = 123369^2 + 27140^2 .

It is not a de Polignac number, because 15956489761 - 2³ = 15956489753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15956489761.

It is not an unprimeable number, because it can be changed into a prime (15956489261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7451751 + ... + 7453891.

Almost surely, 2^15956489761 is an apocalyptic number.

15956489761 is the 126319-th square number.

15956489761 is the 63160-th centered octagonal number.

It is an amenable number.

15956489761 is a deficient number, since it is larger than the sum of its proper divisors (282617682).

15956489761 is an frugal number, since it uses more digits than its factorization.

15956489761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400 (or 2200 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 61.

The spelling of 15956489761 in words is "fifteen billion, nine hundred fifty-six million, four hundred eighty-nine thousand, seven hundred sixty-one".