77879733791 has 4 divisors (see below), whose sum is σ = 78169249800. Its totient is φ = 77590217784.

The previous prime is 77879733721. The next prime is 77879733797. The reversal of 77879733791 is 19733797877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19733797877 = 53 ⋅372335809.

It is a cyclic number.

It is not a de Polignac number, because 77879733791 - 2³⁰ = 76805991967 is a prime.

It is a super-3 number, since 3×77879733791³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77879733797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144757601 + ... + 144758138.

It is an arithmetic number, because the mean of its divisors is an integer number (19542312450).

Almost surely, 2^77879733791 is an apocalyptic number.

77879733791 is a deficient number, since it is larger than the sum of its proper divisors (289516009).

77879733791 is a wasteful number, since it uses less digits than its factorization.

77879733791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289516008.

The product of its digits is 98018424, while the sum is 68.

The spelling of 77879733791 in words is "seventy-seven billion, eight hundred seventy-nine million, seven hundred thirty-three thousand, seven hundred ninety-one".