65856816493 has 32 divisors (see below), whose sum is σ = 72382464000. Its totient is φ = 59556384000.

The previous prime is 65856816461. The next prime is 65856816577. The reversal of 65856816493 is 39461865856.

It is a cyclic number.

It is not a de Polignac number, because 65856816493 - 2⁵ = 65856816461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65856816413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57216468 + ... + 57217618.

It is an arithmetic number, because the mean of its divisors is an integer number (2261952000).

Almost surely, 2^65856816493 is an apocalyptic number.

It is an amenable number.

65856816493 is a deficient number, since it is larger than the sum of its proper divisors (6525647507).

65856816493 is a wasteful number, since it uses less digits than its factorization.

65856816493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693.

The product of its digits is 37324800, while the sum is 61.

The spelling of 65856816493 in words is "sixty-five billion, eight hundred fifty-six million, eight hundred sixteen thousand, four hundred ninety-three".