19976413865 has 16 divisors (see below), whose sum is σ = 24356389008. Its totient is φ = 15725684736.

The previous prime is 19976413823. The next prime is 19976413883. The reversal of 19976413865 is 56831467991.

It can be written as a sum of positive squares in 8 ways, for example, as 3035569216 + 16940844649 = 55096^2 + 130157^2 .

It is a cyclic number.

It is not a de Polignac number, because 19976413865 - 2⁶ = 19976413801 is a prime.

It is a super-2 number, since 2×19976413865² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94847 + ... + 221243.

It is an arithmetic number, because the mean of its divisors is an integer number (1522274313).

Almost surely, 2^19976413865 is an apocalyptic number.

It is an amenable number.

19976413865 is a deficient number, since it is larger than the sum of its proper divisors (4379975143).

19976413865 is a wasteful number, since it uses less digits than its factorization.

19976413865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126908.

The product of its digits is 9797760, while the sum is 59.

The spelling of 19976413865 in words is "nineteen billion, nine hundred seventy-six million, four hundred thirteen thousand, eight hundred sixty-five".