664164015 has 16 divisors (see below), whose sum is σ = 1064583648. Its totient is φ = 353580416.

The previous prime is 664163971. The next prime is 664164029. The reversal of 664164015 is 510461466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664164015 - 2⁹ = 664163503 is a prime.

It is a super-2 number, since 2×664164015² = 882227677641840450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31392 + ... + 48101.

It is an arithmetic number, because the mean of its divisors is an integer number (66536478).

Almost surely, 2^664164015 is an apocalyptic number.

664164015 is a deficient number, since it is larger than the sum of its proper divisors (400419633).

664164015 is a wasteful number, since it uses less digits than its factorization.

664164015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80058.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 664164015 is about 25771.3797651581. The cubic root of 664164015 is about 872.4859602068.

The spelling of 664164015 in words is "six hundred sixty-four million, one hundred sixty-four thousand, fifteen".