125685549662401 has 4 divisors (see below), whose sum is σ = 125828212035204. Its totient is φ = 125542887289600.

The previous prime is 125685549662363. The next prime is 125685549662441. The reversal of 125685549662401 is 104266945586521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41062476816001 + 84623072846400 = 6408001^2 + 9199080^2 .

It is a cyclic number.

It is not a de Polignac number, because 125685549662401 - 2¹³ = 125685549654209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125685549662441) 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, 71331185080 + ... + 71331186841.

It is an arithmetic number, because the mean of its divisors is an integer number (31457053008801).

Almost surely, 2^{125685549662401} is an apocalyptic number.

It is an amenable number.

125685549662401 is a deficient number, since it is larger than the sum of its proper divisors (142662372803).

125685549662401 is an equidigital number, since it uses as much as digits as its factorization.

125685549662401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142662372802.

The product of its (nonzero) digits is 124416000, while the sum is 64.

The spelling of 125685549662401 in words is "one hundred twenty-five trillion, six hundred eighty-five billion, five hundred forty-nine million, six hundred sixty-two thousand, four hundred one".