64606661 has 4 divisors (see below), whose sum is σ = 73836192. Its totient is φ = 55377132.

The previous prime is 64606639. The next prime is 64606673. The reversal of 64606661 is 16660646.

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 64606661 - 2²² = 60412357 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 (64606601) 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, 4614755 + ... + 4614768.

It is an arithmetic number, because the mean of its divisors is an integer number (18459048).

Almost surely, 2^64606661 is an apocalyptic number.

It is an amenable number.

64606661 is a deficient number, since it is larger than the sum of its proper divisors (9229531).

64606661 is an equidigital number, since it uses as much as digits as its factorization.

64606661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229530.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 64606661 is about 8037.8268829330. The cubic root of 64606661 is about 401.2599045183.

The spelling of 64606661 in words is "sixty-four million, six hundred six thousand, six hundred sixty-one".