1625204172101 has 4 divisors (see below), whose sum is σ = 1625213417100. Its totient is φ = 1625194927104.

The previous prime is 1625204172073. The next prime is 1625204172127. The reversal of 1625204172101 is 1012714025261.

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 42199841476 + 1583004330625 = 205426^2 + 1258175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625204172101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625204177101) 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, 4353596 + ... + 4712133.

It is an arithmetic number, because the mean of its divisors is an integer number (406303354275).

Almost surely, 2^{1625204172101} is an apocalyptic number.

It is an amenable number.

1625204172101 is a deficient number, since it is larger than the sum of its proper divisors (9244999).

1625204172101 is an equidigital number, since it uses as much as digits as its factorization.

1625204172101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9244998.

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 1625204172101 its reverse (1012714025261), we get a palindrome (2637918197362).

The spelling of 1625204172101 in words is "one trillion, six hundred twenty-five billion, two hundred four million, one hundred seventy-two thousand, one hundred one".