15972309605 has 16 divisors (see below), whose sum is σ = 21998905344. Its totient is φ = 10905429120.

The previous prime is 15972309599. The next prime is 15972309611. The reversal of 15972309605 is 50690327951.

It is an interprime number because it is at equal distance from previous prime (15972309599) and next prime (15972309611).

It is not a de Polignac number, because 15972309605 - 2⁶ = 15972309541 is a prime.

It is a super-2 number, since 2×15972309605² (a number of 21 digits) contains 22 as substring.

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 15972309605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971141 + ... + 987450.

It is an arithmetic number, because the mean of its divisors is an integer number (1374931584).

Almost surely, 2^15972309605 is an apocalyptic number.

It is an amenable number.

15972309605 is a deficient number, since it is larger than the sum of its proper divisors (6026595739).

15972309605 is a wasteful number, since it uses less digits than its factorization.

15972309605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958836.

The product of its (nonzero) digits is 510300, while the sum is 47.

The spelling of 15972309605 in words is "fifteen billion, nine hundred seventy-two million, three hundred nine thousand, six hundred five".