39931968465 has 40 divisors (see below), whose sum is σ = 73890862848. Its totient is φ = 20610041760.

The previous prime is 39931968449. The next prime is 39931968481. The reversal of 39931968465 is 56486913993.

It is an interprime number because it is at equal distance from previous prime (39931968449) and next prime (39931968481).

It is not a de Polignac number, because 39931968465 - 2⁴ = 39931968449 is a prime.

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 39 ways as a sum of consecutive naturals, for example, 1577727 + ... + 1602836.

Almost surely, 2^39931968465 is an apocalyptic number.

It is an amenable number.

39931968465 is a deficient number, since it is larger than the sum of its proper divisors (33958894383).

39931968465 is a wasteful number, since it uses less digits than its factorization.

39931968465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180611 (or 3180602 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 63.

The spelling of 39931968465 in words is "thirty-nine billion, nine hundred thirty-one million, nine hundred sixty-eight thousand, four hundred sixty-five".