665039898746 has 24 divisors (see below), whose sum is σ = 1068540225120. Its totient is φ = 310317102216.

The previous prime is 665039898739. The next prime is 665039898749. The reversal of 665039898746 is 647898930566.

It is a hoax number, since the sum of its digits (71) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 665039898746.

It is not an unprimeable number, because it can be changed into a prime (665039898749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6825566 + ... + 6922313.

It is an arithmetic number, because the mean of its divisors is an integer number (44522509380).

Almost surely, 2^665039898746 is an apocalyptic number.

665039898746 is a deficient number, since it is larger than the sum of its proper divisors (403500326374).

665039898746 is a wasteful number, since it uses less digits than its factorization.

665039898746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13747986 (or 13747967 counting only the distinct ones).

The product of its (nonzero) digits is 470292480, while the sum is 71.

The spelling of 665039898746 in words is "six hundred sixty-five billion, thirty-nine million, eight hundred ninety-eight thousand, seven hundred forty-six".