6398576621 has 2 divisors, whose sum is σ = 6398576622. Its totient is φ = 6398576620.

The previous prime is 6398576539. The next prime is 6398576641. The reversal of 6398576621 is 1266758936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5782842025 + 615734596 = 76045^2 + 24814^2 .

It is a cyclic number.

It is not a de Polignac number, because 6398576621 - 2²² = 6394382317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6398576641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199288310 + 3199288311.

It is an arithmetic number, because the mean of its divisors is an integer number (3199288311).

Almost surely, 2^6398576621 is an apocalyptic number.

It is an amenable number.

6398576621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6398576621 is an equidigital number, since it uses as much as digits as its factorization.

6398576621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 6398576621 is about 79991.1033865642. The cubic root of 6398576621 is about 1856.4978828218.

The spelling of 6398576621 in words is "six billion, three hundred ninety-eight million, five hundred seventy-six thousand, six hundred twenty-one".