625161104021 has 8 divisors (see below), whose sum is σ = 647555041080. Its totient is φ = 602822944192.

The previous prime is 625161104003. The next prime is 625161104033. The reversal of 625161104021 is 120401161526.

It can be written as a sum of positive squares in 4 ways, for example, as 2262904900 + 622898199121 = 47570^2 + 789239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625161104021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625161104621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13921490 + ... + 13966323.

It is an arithmetic number, because the mean of its divisors is an integer number (80944380135).

Almost surely, 2^625161104021 is an apocalyptic number.

It is an amenable number.

625161104021 is a deficient number, since it is larger than the sum of its proper divisors (22393937059).

625161104021 is a wasteful number, since it uses less digits than its factorization.

625161104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27888615.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 625161104021 its reverse (120401161526), we get a palindrome (745562265547).

The spelling of 625161104021 in words is "six hundred twenty-five billion, one hundred sixty-one million, one hundred four thousand, twenty-one".