125540262045521 has 4 divisors (see below), whose sum is σ = 127668063097200. Its totient is φ = 123412460993844.

The previous prime is 125540262045511. The next prime is 125540262045607.

125540262045521 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125540262045521 is a prime.

It is a super-2 number, since 2×125540262045521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125540262045511) 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, 1063900525751 + ... + 1063900525868.

It is an arithmetic number, because the mean of its divisors is an integer number (31917015774300).

Almost surely, 2^{125540262045521} is an apocalyptic number.

It is an amenable number.

125540262045521 is a deficient number, since it is larger than the sum of its proper divisors (2127801051679).

125540262045521 is an equidigital number, since it uses as much as digits as its factorization.

125540262045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127801051678.

The product of its (nonzero) digits is 960000, while the sum is 44.

The spelling of 125540262045521 in words is "one hundred twenty-five trillion, five hundred forty billion, two hundred sixty-two million, forty-five thousand, five hundred twenty-one".