65640237295 has 4 divisors (see below), whose sum is σ = 78768284760. Its totient is φ = 52512189832.

The previous prime is 65640237281. The next prime is 65640237337. The reversal of 65640237295 is 59273204656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65640237295 - 2⁵ = 65640237263 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 6564023725 + ... + 6564023734.

It is an arithmetic number, because the mean of its divisors is an integer number (19692071190).

Almost surely, 2^65640237295 is an apocalyptic number.

65640237295 is a deficient number, since it is larger than the sum of its proper divisors (13128047465).

65640237295 is a wasteful number, since it uses less digits than its factorization.

65640237295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13128047464.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 65640237295 in words is "sixty-five billion, six hundred forty million, two hundred thirty-seven thousand, two hundred ninety-five".