64929661 has 4 divisors (see below), whose sum is σ = 64994400. Its totient is φ = 64864924.

The previous prime is 64929653. The next prime is 64929673. The reversal of 64929661 is 16692946.

It is a happy number.

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 64929661 - 2³ = 64929653 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 (64929961) 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, 30841 + ... + 32878.

It is an arithmetic number, because the mean of its divisors is an integer number (16248600).

Almost surely, 2^64929661 is an apocalyptic number.

It is an amenable number.

64929661 is a deficient number, since it is larger than the sum of its proper divisors (64739).

64929661 is a wasteful number, since it uses less digits than its factorization.

64929661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64738.

The product of its digits is 139968, while the sum is 43.

The square root of 64929661 is about 8057.8943279246. The cubic root of 64929661 is about 401.9274907794.

The spelling of 64929661 in words is "sixty-four million, nine hundred twenty-nine thousand, six hundred sixty-one".