125510221505 has 4 divisors (see below), whose sum is σ = 150612265812. Its totient is φ = 100408177200.

The previous prime is 125510221493. The next prime is 125510221537. The reversal of 125510221505 is 505122015521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505122015521 = 34519 ⋅14633159.

It can be written as a sum of positive squares in 2 ways, for example, as 47029560769 + 78480660736 = 216863^2 + 280144^2 .

It is not a de Polignac number, because 125510221505 - 2²⁸ = 125241786049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12551022146 + ... + 12551022155.

It is an arithmetic number, because the mean of its divisors is an integer number (37653066453).

Almost surely, 2^125510221505 is an apocalyptic number.

It is an amenable number.

125510221505 is a deficient number, since it is larger than the sum of its proper divisors (25102044307).

125510221505 is an equidigital number, since it uses as much as digits as its factorization.

125510221505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25102044306.

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 125510221505 in words is "one hundred twenty-five billion, five hundred ten million, two hundred twenty-one thousand, five hundred five".