225613357621 has 2 divisors, whose sum is σ = 225613357622. Its totient is φ = 225613357620.

The previous prime is 225613357603. The next prime is 225613357667. The reversal of 225613357621 is 126753316522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201386435121 + 24226922500 = 448761^2 + 155650^2 .

It is a cyclic number.

It is not a de Polignac number, because 225613357621 - 2⁵ = 225613357589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225613357121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112806678810 + 112806678811.

It is an arithmetic number, because the mean of its divisors is an integer number (112806678811).

Almost surely, 2^225613357621 is an apocalyptic number.

It is an amenable number.

225613357621 is a deficient number, since it is larger than the sum of its proper divisors (1).

225613357621 is an equidigital number, since it uses as much as digits as its factorization.

225613357621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 43.

The spelling of 225613357621 in words is "two hundred twenty-five billion, six hundred thirteen million, three hundred fifty-seven thousand, six hundred twenty-one".