65615565491 has 8 divisors (see below), whose sum is σ = 75066773760. Its totient is φ = 56183746248.

The previous prime is 65615565487. The next prime is 65615565493. The reversal of 65615565491 is 19456551656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65615565491 - 2² = 65615565487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65615565493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4840001 + ... + 4853538.

It is an arithmetic number, because the mean of its divisors is an integer number (9383346720).

Almost surely, 2^65615565491 is an apocalyptic number.

65615565491 is a deficient number, since it is larger than the sum of its proper divisors (9451208269).

65615565491 is an equidigital number, since it uses as much as digits as its factorization.

65615565491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9694513.

The product of its digits is 4860000, while the sum is 53.

The spelling of 65615565491 in words is "sixty-five billion, six hundred fifteen million, five hundred sixty-five thousand, four hundred ninety-one".