80029516621 has 2 divisors, whose sum is σ = 80029516622. Its totient is φ = 80029516620.

The previous prime is 80029516573. The next prime is 80029516667. The reversal of 80029516621 is 12661592008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62317633225 + 17711883396 = 249635^2 + 133086^2 .

It is a cyclic number.

It is not a de Polignac number, because 80029516621 - 2⁷ = 80029516493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80029516321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40014758310 + 40014758311.

It is an arithmetic number, because the mean of its divisors is an integer number (40014758311).

Almost surely, 2^80029516621 is an apocalyptic number.

It is an amenable number.

80029516621 is a deficient number, since it is larger than the sum of its proper divisors (1).

80029516621 is an equidigital number, since it uses as much as digits as its factorization.

80029516621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 80029516621 in words is "eighty billion, twenty-nine million, five hundred sixteen thousand, six hundred twenty-one".