625870866432161 has 4 divisors (see below), whose sum is σ = 715280990208192. Its totient is φ = 536460742656132.

The previous prime is 625870866432089. The next prime is 625870866432193. The reversal of 625870866432161 is 161234668078526.

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 not a de Polignac number, because 625870866432161 - 2¹⁰ = 625870866431137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625870866632161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44705061888005 + ... + 44705061888018.

It is an arithmetic number, because the mean of its divisors is an integer number (178820247552048).

Almost surely, 2^{625870866432161} is an apocalyptic number.

It is an amenable number.

625870866432161 is a deficient number, since it is larger than the sum of its proper divisors (89410123776031).

625870866432161 is an equidigital number, since it uses as much as digits as its factorization.

625870866432161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89410123776030.

The product of its (nonzero) digits is 139345920, while the sum is 65.

The spelling of 625870866432161 in words is "six hundred twenty-five trillion, eight hundred seventy billion, eight hundred sixty-six million, four hundred thirty-two thousand, one hundred sixty-one".