1625464664 has 32 divisors (see below), whose sum is σ = 3161072640. Its totient is φ = 782762400.

The previous prime is 1625464661. The next prime is 1625464669. The reversal of 1625464664 is 4664645261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625464661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36797 + ... + 67859.

It is an arithmetic number, because the mean of its divisors is an integer number (98783520).

Almost surely, 2^1625464664 is an apocalyptic number.

It is an amenable number.

1625464664 is a deficient number, since it is larger than the sum of its proper divisors (1535607976).

1625464664 is a wasteful number, since it uses less digits than its factorization.

1625464664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31311 (or 31307 counting only the distinct ones).

The product of its digits is 829440, while the sum is 44.

The square root of 1625464664 is about 40317.0517771327. The cubic root of 1625464664 is about 1175.7793927278.

The spelling of 1625464664 in words is "one billion, six hundred twenty-five million, four hundred sixty-four thousand, six hundred sixty-four".