77963649497 has 2 divisors, whose sum is σ = 77963649498. Its totient is φ = 77963649496.

The previous prime is 77963649479. The next prime is 77963649499. The reversal of 77963649497 is 79494636977.

Together with previous prime (77963649479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58868831641 + 19094817856 = 242629^2 + 138184^2 .

It is a cyclic number.

It is not a de Polignac number, because 77963649497 - 2¹² = 77963645401 is a prime.

Together with 77963649499, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77963649497.

It is not a weakly prime, because it can be changed into another prime (77963649499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38981824748 + 38981824749.

It is an arithmetic number, because the mean of its divisors is an integer number (38981824749).

Almost surely, 2^77963649497 is an apocalyptic number.

It is an amenable number.

77963649497 is a deficient number, since it is larger than the sum of its proper divisors (1).

77963649497 is an equidigital number, since it uses as much as digits as its factorization.

77963649497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432081216, while the sum is 71.

The spelling of 77963649497 in words is "seventy-seven billion, nine hundred sixty-three million, six hundred forty-nine thousand, four hundred ninety-seven".