634172800621 has 2 divisors, whose sum is σ = 634172800622. Its totient is φ = 634172800620.

The previous prime is 634172800601. The next prime is 634172800669. The reversal of 634172800621 is 126008271436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417774786025 + 216398014596 = 646355^2 + 465186^2 .

It is a cyclic number.

It is not a de Polignac number, because 634172800621 - 2⁹ = 634172800109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634172800601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317086400310 + 317086400311.

It is an arithmetic number, because the mean of its divisors is an integer number (317086400311).

Almost surely, 2^634172800621 is an apocalyptic number.

It is an amenable number.

634172800621 is a deficient number, since it is larger than the sum of its proper divisors (1).

634172800621 is an equidigital number, since it uses as much as digits as its factorization.

634172800621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 634172800621 in words is "six hundred thirty-four billion, one hundred seventy-two million, eight hundred thousand, six hundred twenty-one".