64669697 has 4 divisors (see below), whose sum is σ = 66045696. Its totient is φ = 63293700.

The previous prime is 64669679. The next prime is 64669733. The reversal of 64669697 is 79696646.

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 a de Polignac number, because none of the positive numbers 2^k-64669697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64669607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687929 + ... + 688022.

It is an arithmetic number, because the mean of its divisors is an integer number (16511424).

Almost surely, 2^64669697 is an apocalyptic number.

It is an amenable number.

64669697 is a deficient number, since it is larger than the sum of its proper divisors (1375999).

64669697 is a wasteful number, since it uses less digits than its factorization.

64669697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375998.

The product of its digits is 2939328, while the sum is 53.

The square root of 64669697 is about 8041.7471360395. The cubic root of 64669697 is about 401.3903637058.

The spelling of 64669697 in words is "sixty-four million, six hundred sixty-nine thousand, six hundred ninety-seven".