445342556621 has 2 divisors, whose sum is σ = 445342556622. Its totient is φ = 445342556620.

The previous prime is 445342556611. The next prime is 445342556669. The reversal of 445342556621 is 126655243544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308120467396 + 137222089225 = 555086^2 + 370435^2 .

It is a cyclic number.

It is not a de Polignac number, because 445342556621 - 2²² = 445338362317 is a prime.

It is a super-3 number, since 3×445342556621³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445342556611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222671278310 + 222671278311.

It is an arithmetic number, because the mean of its divisors is an integer number (222671278311).

Almost surely, 2^445342556621 is an apocalyptic number.

It is an amenable number.

445342556621 is a deficient number, since it is larger than the sum of its proper divisors (1).

445342556621 is an equidigital number, since it uses as much as digits as its factorization.

445342556621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 47.

The spelling of 445342556621 in words is "four hundred forty-five billion, three hundred forty-two million, five hundred fifty-six thousand, six hundred twenty-one".