76802120621 has 2 divisors, whose sum is σ = 76802120622. Its totient is φ = 76802120620.

The previous prime is 76802120609. The next prime is 76802120641. The reversal of 76802120621 is 12602120867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54435422596 + 22366698025 = 233314^2 + 149555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76802120621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76802120641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38401060310 + 38401060311.

It is an arithmetic number, because the mean of its divisors is an integer number (38401060311).

Almost surely, 2^76802120621 is an apocalyptic number.

It is an amenable number.

76802120621 is a deficient number, since it is larger than the sum of its proper divisors (1).

76802120621 is an equidigital number, since it uses as much as digits as its factorization.

76802120621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 76802120621 in words is "seventy-six billion, eight hundred two million, one hundred twenty thousand, six hundred twenty-one".