239965971965 has 16 divisors (see below), whose sum is σ = 289521314928. Its totient is φ = 190931828736.

The previous prime is 239965971937. The next prime is 239965971991. The reversal of 239965971965 is 569179569932.

It can be written as a sum of positive squares in 8 ways, for example, as 29745555961 + 210220416004 = 172469^2 + 458498^2 .

It is a cyclic number.

It is not a de Polignac number, because 239965971965 - 2⁶ = 239965971901 is a prime.

It is a super-2 number, since 2×239965971965² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

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, 4273109 + ... + 4328901.

It is an arithmetic number, because the mean of its divisors is an integer number (18095082183).

Almost surely, 2^239965971965 is an apocalyptic number.

It is an amenable number.

239965971965 is a deficient number, since it is larger than the sum of its proper divisors (49555342963).

239965971965 is a wasteful number, since it uses less digits than its factorization.

239965971965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60448.

The product of its digits is 248005800, while the sum is 71.

The spelling of 239965971965 in words is "two hundred thirty-nine billion, nine hundred sixty-five million, nine hundred seventy-one thousand, nine hundred sixty-five".