1555125500128 has 24 divisors (see below), whose sum is σ = 3067091469288. Its totient is φ = 776181634944.

The previous prime is 1555125500111. The next prime is 1555125500129. The reversal of 1555125500128 is 8210055215551.

It is a super-2 number, since 2×1555125500128² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555125500129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43141551 + ... + 43177582.

It is an arithmetic number, because the mean of its divisors is an integer number (127795477887).

Almost surely, 2^{1555125500128} is an apocalyptic number.

It is an amenable number.

1555125500128 is a deficient number, since it is larger than the sum of its proper divisors (1511965969160).

1555125500128 is an equidigital number, since it uses as much as digits as its factorization.

1555125500128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86319706 (or 86319698 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 40.

The spelling of 1555125500128 in words is "one trillion, five hundred fifty-five billion, one hundred twenty-five million, five hundred thousand, one hundred twenty-eight".