725215009122 has 18 divisors (see below), whose sum is σ = 1571307014667. Its totient is φ = 241737132036.

The previous prime is 725215009117. The next prime is 725215009139. The reversal of 725215009122 is 221900512527.

725215009122 is a `hidden beast` number, since 7 + 2 + 5 + 21 + 500 + 9 + 122 = 666.

725215009122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 362607504561 + 362607504561 = 602169^2 + 602169^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=602169.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3512653 + ... + 3713375.

Almost surely, 2^725215009122 is an apocalyptic number.

725215009122 is an abundant number, since it is smaller than the sum of its proper divisors (846092005545).

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

725215009122 is an frugal number, since it uses more digits than its factorization.

725215009122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401454 (or 200728 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 725215009122 in words is "seven hundred twenty-five billion, two hundred fifteen million, nine thousand, one hundred twenty-two".