125635363536521 has 4 divisors (see below), whose sum is σ = 125692289394432. Its totient is φ = 125578437678612.

The previous prime is 125635363536503. The next prime is 125635363536547.

125635363536521 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 not a de Polignac number, because 125635363536521 - 2¹⁴ = 125635363520137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125635363536581) 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, 28462925645 + ... + 28462930058.

It is an arithmetic number, because the mean of its divisors is an integer number (31423072348608).

Almost surely, 2^{125635363536521} is an apocalyptic number.

It is an amenable number.

125635363536521 is a deficient number, since it is larger than the sum of its proper divisors (56925857911).

125635363536521 is an equidigital number, since it uses as much as digits as its factorization.

125635363536521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56925857910.

The product of its digits is 43740000, while the sum is 56.

The spelling of 125635363536521 in words is "one hundred twenty-five trillion, six hundred thirty-five billion, three hundred sixty-three million, five hundred thirty-six thousand, five hundred twenty-one".