1664256706 has 16 divisors (see below), whose sum is σ = 2856165120. Its totient is φ = 712464480.

The previous prime is 1664256637. The next prime is 1664256757. The reversal of 1664256706 is 6076524661.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52491 + ... + 77998.

It is an arithmetic number, because the mean of its divisors is an integer number (178510320).

Almost surely, 2^1664256706 is an apocalyptic number.

1664256706 is a deficient number, since it is larger than the sum of its proper divisors (1191908414).

1664256706 is a wasteful number, since it uses less digits than its factorization.

1664256706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131409.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 1664256706 is about 40795.3024991849. The cubic root of 1664256706 is about 1185.0593609697.

The spelling of 1664256706 in words is "one billion, six hundred sixty-four million, two hundred fifty-six thousand, seven hundred six".