8445592974821 has 2 divisors, whose sum is σ = 8445592974822. Its totient is φ = 8445592974820.

The previous prime is 8445592974817. The next prime is 8445592974859. The reversal of 8445592974821 is 1284792955448.

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., 8298835792900 + 146757181921 = 2880770^2 + 383089^2 .

It is a cyclic number.

It is not a de Polignac number, because 8445592974821 - 2² = 8445592974817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8445592974881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4222796487410 + 4222796487411.

It is an arithmetic number, because the mean of its divisors is an integer number (4222796487411).

Almost surely, 2^{8445592974821} is an apocalyptic number.

It is an amenable number.

8445592974821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8445592974821 is an equidigital number, since it uses as much as digits as its factorization.

8445592974821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 232243200, while the sum is 68.

The spelling of 8445592974821 in words is "eight trillion, four hundred forty-five billion, five hundred ninety-two million, nine hundred seventy-four thousand, eight hundred twenty-one".