1252265664 has 84 divisors (see below), whose sum is σ = 3587852616. Its totient is φ = 385302528.

The previous prime is 1252265647. The next prime is 1252265671. The reversal of 1252265664 is 4665622521.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13152 + ... + 51744.

Almost surely, 2^1252265664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1252265664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793926308).

1252265664 is an abundant number, since it is smaller than the sum of its proper divisors (2335586952).

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

1252265664 is a wasteful number, since it uses less digits than its factorization.

1252265664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38634 (or 38611 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 1252265664 is about 35387.3658810599. The cubic root of 1252265664 is about 1077.8677822105.

The spelling of 1252265664 in words is "one billion, two hundred fifty-two million, two hundred sixty-five thousand, six hundred sixty-four".