77315052749 has 4 divisors (see below), whose sum is σ = 84343693920. Its totient is φ = 70286411580.

The previous prime is 77315052677. The next prime is 77315052779. The reversal of 77315052749 is 94725051377.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94725051377 = 11 ⋅8611368307.

It is not a de Polignac number, because 77315052749 - 2²⁸ = 77046617293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77315052697 and 77315052706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77315052779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3514320569 + ... + 3514320590.

It is an arithmetic number, because the mean of its divisors is an integer number (21085923480).

Almost surely, 2^77315052749 is an apocalyptic number.

It is an amenable number.

77315052749 is a deficient number, since it is larger than the sum of its proper divisors (7028641171).

77315052749 is a wasteful number, since it uses less digits than its factorization.

77315052749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7028641170.

The product of its (nonzero) digits is 1852200, while the sum is 50.

The spelling of 77315052749 in words is "seventy-seven billion, three hundred fifteen million, fifty-two thousand, seven hundred forty-nine".