15980694965 has 4 divisors (see below), whose sum is σ = 19176833964. Its totient is φ = 12784555968.

The previous prime is 15980694949. The next prime is 15980694973. The reversal of 15980694965 is 56949608951.

It is a happy number.

15980694965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4293787729 + 11686907236 = 65527^2 + 108106^2 .

It is a cyclic number.

It is not a de Polignac number, because 15980694965 - 2⁴ = 15980694949 is a prime.

It is a super-2 number, since 2×15980694965² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15980694898 and 15980694907.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1598069492 + ... + 1598069501.

It is an arithmetic number, because the mean of its divisors is an integer number (4794208491).

Almost surely, 2^15980694965 is an apocalyptic number.

It is an amenable number.

15980694965 is a deficient number, since it is larger than the sum of its proper divisors (3196138999).

15980694965 is an equidigital number, since it uses as much as digits as its factorization.

15980694965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196138998.

The product of its (nonzero) digits is 20995200, while the sum is 62.

The spelling of 15980694965 in words is "fifteen billion, nine hundred eighty million, six hundred ninety-four thousand, nine hundred sixty-five".