1664126656 has 28 divisors (see below), whose sum is σ = 3313046968. Its totient is φ = 829343232.

The previous prime is 1664126627. The next prime is 1664126699. The reversal of 1664126656 is 6566214661.

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, 22701 + ... + 61996.

It is an arithmetic number, because the mean of its divisors is an integer number (118323106).

Almost surely, 2^1664126656 is an apocalyptic number.

1664126656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1664126656 is a deficient number, since it is larger than the sum of its proper divisors (1648920312).

1664126656 is an equidigital number, since it uses as much as digits as its factorization.

1664126656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85016 (or 85006 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 1664126656 is about 40793.7085345277. The cubic root of 1664126656 is about 1185.0284921372.

The spelling of 1664126656 in words is "one billion, six hundred sixty-four million, one hundred twenty-six thousand, six hundred fifty-six".