65609997 has 4 divisors (see below), whose sum is σ = 87480000. Its totient is φ = 43739996.

The previous prime is 65609989. The next prime is 65610001. The reversal of 65609997 is 79990656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65609997 - 2³ = 65609989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65609497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10934997 + ... + 10935002.

It is an arithmetic number, because the mean of its divisors is an integer number (21870000).

Almost surely, 2^65609997 is an apocalyptic number.

It is an amenable number.

65609997 is a deficient number, since it is larger than the sum of its proper divisors (21870003).

65609997 is a wasteful number, since it uses less digits than its factorization.

65609997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21870002.

The product of its (nonzero) digits is 918540, while the sum is 51.

The square root of 65609997 is about 8099.9998148148. Note that the first 3 decimals coincide. The cubic root of 65609997 is about 403.3264210428.

The spelling of 65609997 in words is "sixty-five million, six hundred nine thousand, nine hundred ninety-seven".