1664657004 has 24 divisors (see below), whose sum is σ = 3898646640. Its totient is φ = 552821824.

The previous prime is 1664656991. The next prime is 1664657023. The reversal of 1664657004 is 4007564661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254619 + ... + 261074.

It is an arithmetic number, because the mean of its divisors is an integer number (162443610).

Almost surely, 2^1664657004 is an apocalyptic number.

It is an amenable number.

1664657004 is an abundant number, since it is smaller than the sum of its proper divisors (2233989636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664657004 is a wasteful number, since it uses less digits than its factorization.

1664657004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515969 (or 515967 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 1664657004 is about 40800.2083818208. The cubic root of 1664657004 is about 1185.1543661176.

The spelling of 1664657004 in words is "one billion, six hundred sixty-four million, six hundred fifty-seven thousand, four".