125520400551 has 32 divisors (see below), whose sum is σ = 206427289600. Its totient is φ = 66065497344.

The previous prime is 125520400519. The next prime is 125520400573. The reversal of 125520400551 is 155004025521.

It is not a de Polignac number, because 125520400551 - 2⁵ = 125520400519 is a prime.

It is a super-2 number, since 2×125520400551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125520400501) 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 31 ways as a sum of consecutive naturals, for example, 370126 + ... + 622923.

It is an arithmetic number, because the mean of its divisors is an integer number (6450852800).

Almost surely, 2^125520400551 is an apocalyptic number.

125520400551 is a deficient number, since it is larger than the sum of its proper divisors (80906889049).

125520400551 is a wasteful number, since it uses less digits than its factorization.

125520400551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993535.

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 125520400551 in words is "one hundred twenty-five billion, five hundred twenty million, four hundred thousand, five hundred fifty-one".