77066997647 has 2 divisors, whose sum is σ = 77066997648. Its totient is φ = 77066997646.

The previous prime is 77066997571. The next prime is 77066997659. The reversal of 77066997647 is 74679966077.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77066997647 - 2²⁴ = 77050220431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77066997247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38533498823 + 38533498824.

It is an arithmetic number, because the mean of its divisors is an integer number (38533498824).

Almost surely, 2^77066997647 is an apocalyptic number.

77066997647 is a deficient number, since it is larger than the sum of its proper divisors (1).

77066997647 is an equidigital number, since it uses as much as digits as its factorization.

77066997647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168031584, while the sum is 68.

The spelling of 77066997647 in words is "seventy-seven billion, sixty-six million, nine hundred ninety-seven thousand, six hundred forty-seven".