77497797647 has 2 divisors, whose sum is σ = 77497797648. Its totient is φ = 77497797646.

The previous prime is 77497797623. The next prime is 77497797733. The reversal of 77497797647 is 74679779477.

It is a weak prime.

It is an emirp because it is prime and its reverse (74679779477) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77497797647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77497757647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38748898823 + 38748898824.

It is an arithmetic number, because the mean of its divisors is an integer number (38748898824).

Almost surely, 2^77497797647 is an apocalyptic number.

77497797647 is a deficient number, since it is larger than the sum of its proper divisors (1).

77497797647 is an equidigital number, since it uses as much as digits as its factorization.

77497797647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 914838624, while the sum is 74.

The spelling of 77497797647 in words is "seventy-seven billion, four hundred ninety-seven million, seven hundred ninety-seven thousand, six hundred forty-seven".