77336993549 has 18 divisors (see below), whose sum is σ = 80895062430. Its totient is φ = 73847456256.

The previous prime is 77336993479. The next prime is 77336993551. The reversal of 77336993549 is 94539963377.

It can be written as a sum of positive squares in 9 ways, for example, as 26388378025 + 50948615524 = 162445^2 + 225718^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77336993549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77336993449) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 169227329 + ... + 169227785.

It is an arithmetic number, because the mean of its divisors is an integer number (4494170135).

Almost surely, 2^77336993549 is an apocalyptic number.

It is an amenable number.

77336993549 is a deficient number, since it is larger than the sum of its proper divisors (3558068881).

77336993549 is an frugal number, since it uses more digits than its factorization.

77336993549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169 (or 599 counting only the distinct ones).

The product of its digits is 115736040, while the sum is 65.

The spelling of 77336993549 in words is "seventy-seven billion, three hundred thirty-six million, nine hundred ninety-three thousand, five hundred forty-nine".