77970059621 has 2 divisors, whose sum is σ = 77970059622. Its totient is φ = 77970059620.

The previous prime is 77970059599. The next prime is 77970059701. The reversal of 77970059621 is 12695007977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76978502500 + 991557121 = 277450^2 + 31489^2 .

It is a cyclic number.

It is not a de Polignac number, because 77970059621 - 2¹⁴ = 77970043237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77970059021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38985029810 + 38985029811.

It is an arithmetic number, because the mean of its divisors is an integer number (38985029811).

Almost surely, 2^77970059621 is an apocalyptic number.

It is an amenable number.

77970059621 is a deficient number, since it is larger than the sum of its proper divisors (1).

77970059621 is an equidigital number, since it uses as much as digits as its factorization.

77970059621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1666980, while the sum is 53.

The spelling of 77970059621 in words is "seventy-seven billion, nine hundred seventy million, fifty-nine thousand, six hundred twenty-one".