64155967 has 4 divisors (see below), whose sum is σ = 64261240. Its totient is φ = 64050696.

The previous prime is 64155937. The next prime is 64155991. The reversal of 64155967 is 76955146.

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

It is a cyclic number.

It is not a de Polignac number, because 64155967 - 2¹⁹ = 63631679 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 (64155937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51717 + ... + 52942.

It is an arithmetic number, because the mean of its divisors is an integer number (16065310).

Almost surely, 2^64155967 is an apocalyptic number.

64155967 is a deficient number, since it is larger than the sum of its proper divisors (105273).

64155967 is a wasteful number, since it uses less digits than its factorization.

64155967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105272.

The product of its digits is 226800, while the sum is 43.

The square root of 64155967 is about 8009.7420058326. The cubic root of 64155967 is about 400.3246676560.

The spelling of 64155967 in words is "sixty-four million, one hundred fifty-five thousand, nine hundred sixty-seven".