65731720475 has 12 divisors (see below), whose sum is σ = 81517516920. Its totient is φ = 52578806400.

The previous prime is 65731720459. The next prime is 65731720489. The reversal of 65731720475 is 57402713756.

It is a happy number.

It is not a de Polignac number, because 65731720475 - 2⁴ = 65731720459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45080 + ... + 365370.

It is an arithmetic number, because the mean of its divisors is an integer number (6793126410).

Almost surely, 2^65731720475 is an apocalyptic number.

65731720475 is a deficient number, since it is larger than the sum of its proper divisors (15785796445).

65731720475 is a wasteful number, since it uses less digits than its factorization.

65731720475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328510 (or 328505 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 65731720475 in words is "sixty-five billion, seven hundred thirty-one million, seven hundred twenty thousand, four hundred seventy-five".