1252100052540 has 120 divisors (see below), whose sum is σ = 3935886503472. Its totient is φ = 333213108480.

The previous prime is 1252100052521. The next prime is 1252100052547. The reversal of 1252100052540 is 452500012521.

1252100052540 is a `hidden beast` number, since 12 + 5 + 2 + 100 + 0 + 5 + 2 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252100052547) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8352 + ... + 1582488.

Almost surely, 2^{1252100052540} is an apocalyptic number.

1252100052540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1252100052540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1967943251736).

1252100052540 is an abundant number, since it is smaller than the sum of its proper divisors (2683786450932).

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

1252100052540 is a wasteful number, since it uses less digits than its factorization.

1252100052540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574649 (or 1574638 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 1252100052540 in words is "one trillion, two hundred fifty-two billion, one hundred million, fifty-two thousand, five hundred forty".