64536661 has 4 divisors (see below), whose sum is σ = 73756192. Its totient is φ = 55317132.

The previous prime is 64536653. The next prime is 64536697. The reversal of 64536661 is 16663546.

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 64536661 - 2³ = 64536653 is a prime.

It is a super-2 number, since 2×64536661² = 8329961226057842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64536661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64536061) 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, 4609755 + ... + 4609768.

It is an arithmetic number, because the mean of its divisors is an integer number (18439048).

Almost surely, 2^64536661 is an apocalyptic number.

It is an amenable number.

64536661 is a deficient number, since it is larger than the sum of its proper divisors (9219531).

64536661 is an equidigital number, since it uses as much as digits as its factorization.

64536661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219530.

The product of its digits is 77760, while the sum is 37.

The square root of 64536661 is about 8033.4712920381. The cubic root of 64536661 is about 401.1149331727.

The spelling of 64536661 in words is "sixty-four million, five hundred thirty-six thousand, six hundred sixty-one".