64156685 has 4 divisors (see below), whose sum is σ = 76988028. Its totient is φ = 51325344.

The previous prime is 64156667. The next prime is 64156693. The reversal of 64156685 is 58665146.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33895684 + 30261001 = 5822^2 + 5501^2 .

It is a cyclic number.

It is not a de Polignac number, because 64156685 - 2⁶ = 64156621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6415664 + ... + 6415673.

It is an arithmetic number, because the mean of its divisors is an integer number (19247007).

Almost surely, 2^64156685 is an apocalyptic number.

It is an amenable number.

64156685 is a deficient number, since it is larger than the sum of its proper divisors (12831343).

64156685 is a wasteful number, since it uses less digits than its factorization.

64156685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12831342.

The product of its digits is 172800, while the sum is 41.

The square root of 64156685 is about 8009.7868261271. The cubic root of 64156685 is about 400.3261610585.

The spelling of 64156685 in words is "sixty-four million, one hundred fifty-six thousand, six hundred eighty-five".