39966390864 has 180 divisors, whose sum is σ = 123183249696. Its totient is φ = 12071866752.

The previous prime is 39966390859. The next prime is 39966390913. The reversal of 39966390864 is 46809366993.

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 35 ways as a sum of consecutive naturals, for example, 1178919 + ... + 1212345.

Almost surely, 2^39966390864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39966390864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61591624848).

39966390864 is an abundant number, since it is smaller than the sum of its proper divisors (83216858832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39966390864 is a wasteful number, since it uses less digits than its factorization.

39966390864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33502 (or 33474 counting only the distinct ones).

The product of its (nonzero) digits is 45349632, while the sum is 63.

The spelling of 39966390864 in words is "thirty-nine billion, nine hundred sixty-six million, three hundred ninety thousand, eight hundred sixty-four".