1252766664 has 24 divisors (see below), whose sum is σ = 3392909910. Its totient is φ = 417588864.

The previous prime is 1252766663. The next prime is 1252766677. The reversal of 1252766664 is 4666672521.

It can be written as a sum of positive squares in only one way, i.e., 1114892100 + 137874564 = 33390^2 + 11742^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1252766663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8699697 + ... + 8699840.

Almost surely, 2^1252766664 is an apocalyptic number.

It is an amenable number.

1252766664 is an abundant number, since it is smaller than the sum of its proper divisors (2140143246).

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

1252766664 is a wasteful number, since it uses less digits than its factorization.

1252766664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17399549 (or 17399542 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 1252766664 is about 35394.4439707703. The cubic root of 1252766664 is about 1078.0115056433.

The spelling of 1252766664 in words is "one billion, two hundred fifty-two million, seven hundred sixty-six thousand, six hundred sixty-four".