6638296654021 has 2 divisors, whose sum is σ = 6638296654022. Its totient is φ = 6638296654020.

The previous prime is 6638296654009. The next prime is 6638296654091. The reversal of 6638296654021 is 1204566928366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6257447217121 + 380849436900 = 2501489^2 + 617130^2 .

It is a cyclic number.

It is not a de Polignac number, because 6638296654021 - 2³⁹ = 6088540840133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6638296654091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319148327010 + 3319148327011.

It is an arithmetic number, because the mean of its divisors is an integer number (3319148327011).

Almost surely, 2^{6638296654021} is an apocalyptic number.

It is an amenable number.

6638296654021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638296654021 is an equidigital number, since it uses as much as digits as its factorization.

6638296654021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22394880, while the sum is 58.

The spelling of 6638296654021 in words is "six trillion, six hundred thirty-eight billion, two hundred ninety-six million, six hundred fifty-four thousand, twenty-one".