125440521555 has 32 divisors (see below), whose sum is σ = 204486508800. Its totient is φ = 65651876480.

The previous prime is 125440521527. The next prime is 125440521589. The reversal of 125440521555 is 555125044521.

It is a happy number.

It is not a de Polignac number, because 125440521555 - 2¹⁵ = 125440488787 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152601 + ... + 523610.

It is an arithmetic number, because the mean of its divisors is an integer number (6390203400).

Almost surely, 2^125440521555 is an apocalyptic number.

125440521555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

125440521555 is a deficient number, since it is larger than the sum of its proper divisors (79045987245).

125440521555 is a wasteful number, since it uses less digits than its factorization.

125440521555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676451.

The product of its (nonzero) digits is 200000, while the sum is 39.

The spelling of 125440521555 in words is "one hundred twenty-five billion, four hundred forty million, five hundred twenty-one thousand, five hundred fifty-five".