664605051 has 32 divisors (see below), whose sum is σ = 995106816. Its totient is φ = 391092000.

The previous prime is 664605041. The next prime is 664605061. The reversal of 664605051 is 150506466.

It is an interprime number because it is at equal distance from previous prime (664605041) and next prime (664605061).

It is not a de Polignac number, because 664605051 - 2²⁵ = 631050619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (664605041) 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 31 ways as a sum of consecutive naturals, for example, 201546 + ... + 204816.

It is an arithmetic number, because the mean of its divisors is an integer number (31097088).

Almost surely, 2^664605051 is an apocalyptic number.

664605051 is a deficient number, since it is larger than the sum of its proper divisors (330501765).

664605051 is a wasteful number, since it uses less digits than its factorization.

664605051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 664605051 is about 25779.9350464659. The cubic root of 664605051 is about 872.6790413163.

The spelling of 664605051 in words is "six hundred sixty-four million, six hundred five thousand, fifty-one".