65685947392 has 44 divisors (see below), whose sum is σ = 141408373036. Its totient is φ = 30316584960.

The previous prime is 65685947381. The next prime is 65685947407. The reversal of 65685947392 is 29374958656.

It can be written as a sum of positive squares in 2 ways, for example, as 19896795136 + 45789152256 = 141056^2 + 213984^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2453859 + ... + 2480482.

Almost surely, 2^65685947392 is an apocalyptic number.

It is an amenable number.

65685947392 is an abundant number, since it is smaller than the sum of its proper divisors (75722425644).

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

65685947392 is a wasteful number, since it uses less digits than its factorization.

65685947392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934374 (or 4934356 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 64.

The spelling of 65685947392 in words is "sixty-five billion, six hundred eighty-five million, nine hundred forty-seven thousand, three hundred ninety-two".