1252521664 has 14 divisors (see below), whose sum is σ = 2485472804. Its totient is φ = 626260800.

The previous prime is 1252521661. The next prime is 1252521689. The reversal of 1252521664 is 4661252521.

It is not an unprimeable number, because it can be changed into a prime (1252521661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9785262 + ... + 9785389.

Almost surely, 2^1252521664 is an apocalyptic number.

It is an amenable number.

1252521664 is a deficient number, since it is larger than the sum of its proper divisors (1232951140).

1252521664 is an equidigital number, since it uses as much as digits as its factorization.

1252521664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19570663 (or 19570653 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 1252521664 is about 35390.9828063590. The cubic root of 1252521664 is about 1077.9412265175.

The spelling of 1252521664 in words is "one billion, two hundred fifty-two million, five hundred twenty-one thousand, six hundred sixty-four".