77097702149 has 6 divisors (see below), whose sum is σ = 83484494226. Its totient is φ = 71167109520.

The previous prime is 77097702113. The next prime is 77097702151. The reversal of 77097702149 is 94120779077.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8109002500 + 68988699649 = 90050^2 + 262657^2 .

It is not a de Polignac number, because 77097702149 - 2²⁴ = 77080924933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77097702149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77097702109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 228099542 + ... + 228099879.

It is an arithmetic number, because the mean of its divisors is an integer number (13914082371).

Almost surely, 2^77097702149 is an apocalyptic number.

It is an amenable number.

77097702149 is a deficient number, since it is larger than the sum of its proper divisors (6386792077).

77097702149 is a wasteful number, since it uses less digits than its factorization.

77097702149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456199447 (or 456199434 counting only the distinct ones).

The product of its (nonzero) digits is 1555848, while the sum is 53.

The spelling of 77097702149 in words is "seventy-seven billion, ninety-seven million, seven hundred two thousand, one hundred forty-nine".