155420752725 has 72 divisors (see below), whose sum is σ = 329927008320. Its totient is φ = 71049467520.

The previous prime is 155420752703. The next prime is 155420752727. The reversal of 155420752725 is 527257024551.

155420752725 is a `hidden beast` number, since 1 + 554 + 2 + 0 + 75 + 2 + 7 + 25 = 666.

It is not a de Polignac number, because 155420752725 - 2⁸ = 155420752469 is a prime.

It is a super-2 number, since 2×155420752725² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155420752727) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1784880 + ... + 1869929.

It is an arithmetic number, because the mean of its divisors is an integer number (4582319560).

Almost surely, 2^155420752725 is an apocalyptic number.

155420752725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155420752725 is an abundant number, since it is smaller than the sum of its proper divisors (174506255595).

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

155420752725 is an equidigital number, since it uses as much as digits as its factorization.

155420752725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654841 (or 3654824 counting only the distinct ones).

The product of its (nonzero) digits is 980000, while the sum is 45.

The spelling of 155420752725 in words is "one hundred fifty-five billion, four hundred twenty million, seven hundred fifty-two thousand, seven hundred twenty-five".