1325445356621 has 4 divisors (see below), whose sum is σ = 1325811809052. Its totient is φ = 1325078904192.

The previous prime is 1325445356603. The next prime is 1325445356629. The reversal of 1325445356621 is 1266535445231.

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 79518360100 + 1245926996521 = 281990^2 + 1116211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325445356621 - 2³⁸ = 1050567449677 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 (1325445356629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183220790 + ... + 183228023.

It is an arithmetic number, because the mean of its divisors is an integer number (331452952263).

Almost surely, 2^{1325445356621} is an apocalyptic number.

It is an amenable number.

1325445356621 is a deficient number, since it is larger than the sum of its proper divisors (366452431).

1325445356621 is an equidigital number, since it uses as much as digits as its factorization.

1325445356621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366452430.

The product of its digits is 2592000, while the sum is 47.

The spelling of 1325445356621 in words is "one trillion, three hundred twenty-five billion, four hundred forty-five million, three hundred fifty-six thousand, six hundred twenty-one".