65731780472 has 16 divisors (see below), whose sum is σ = 123352355400. Its totient is φ = 32837819040.

The previous prime is 65731780463. The next prime is 65731780489. The reversal of 65731780472 is 27408713756.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 65731780472.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3498947 + ... + 3517682.

Almost surely, 2^65731780472 is an apocalyptic number.

It is an amenable number.

65731780472 is a deficient number, since it is larger than the sum of its proper divisors (57620574928).

65731780472 is a wasteful number, since it uses less digits than its factorization.

65731780472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7017806 (or 7017802 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 50.

The spelling of 65731780472 in words is "sixty-five billion, seven hundred thirty-one million, seven hundred eighty thousand, four hundred seventy-two".