63320975821 has 2 divisors, whose sum is σ = 63320975822. Its totient is φ = 63320975820.

The previous prime is 63320975801. The next prime is 63320975863. The reversal of 63320975821 is 12857902336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62330614921 + 990360900 = 249661^2 + 31470^2 .

It is a cyclic number.

It is not a de Polignac number, because 63320975821 - 2²⁵ = 63287421389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63320975801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31660487910 + 31660487911.

It is an arithmetic number, because the mean of its divisors is an integer number (31660487911).

Almost surely, 2^63320975821 is an apocalyptic number.

It is an amenable number.

63320975821 is a deficient number, since it is larger than the sum of its proper divisors (1).

63320975821 is an equidigital number, since it uses as much as digits as its factorization.

63320975821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 63320975821 in words is "sixty-three billion, three hundred twenty million, nine hundred seventy-five thousand, eight hundred twenty-one".