125131621506 has 16 divisors (see below), whose sum is σ = 264984610464. Its totient is φ = 39256979264.

The previous prime is 125131621499. The next prime is 125131621513. The reversal of 125131621506 is 605126131521.

It is an interprime number because it is at equal distance from previous prime (125131621499) and next prime (125131621513).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613390200 + ... + 613390403.

It is an arithmetic number, because the mean of its divisors is an integer number (16561538154).

Almost surely, 2^125131621506 is an apocalyptic number.

125131621506 is an abundant number, since it is smaller than the sum of its proper divisors (139852988958).

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

125131621506 is a wasteful number, since it uses less digits than its factorization.

125131621506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226780625.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 125131621506 in words is "one hundred twenty-five billion, one hundred thirty-one million, six hundred twenty-one thousand, five hundred six".