725612135220 has 144 divisors (see below), whose sum is σ = 2647847879040. Its totient is φ = 157125028608.

The previous prime is 725612135203. The next prime is 725612135221. The reversal of 725612135220 is 22531216527.

725612135220 is a `hidden beast` number, since 7 + 2 + 5 + 6 + 121 + 3 + 522 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725612135221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15130867 + ... + 15178746.

Almost surely, 2^725612135220 is an apocalyptic number.

725612135220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

725612135220 is an abundant number, since it is smaller than the sum of its proper divisors (1922235743820).

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

725612135220 is a wasteful number, since it uses less digits than its factorization.

725612135220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30309654 (or 30309649 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 725612135220 in words is "seven hundred twenty-five billion, six hundred twelve million, one hundred thirty-five thousand, two hundred twenty".