77929243391 has 8 divisors (see below), whose sum is σ = 80452420224. Its totient is φ = 75406649760.

The previous prime is 77929243361. The next prime is 77929243393. The reversal of 77929243391 is 19334292977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77929243391 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 (77929243393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134345 + ... + 417021.

It is an arithmetic number, because the mean of its divisors is an integer number (10056552528).

Almost surely, 2^77929243391 is an apocalyptic number.

77929243391 is a deficient number, since it is larger than the sum of its proper divisors (2523176833).

77929243391 is a wasteful number, since it uses less digits than its factorization.

77929243391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291601.

The product of its digits is 5143824, while the sum is 56.

The spelling of 77929243391 in words is "seventy-seven billion, nine hundred twenty-nine million, two hundred forty-three thousand, three hundred ninety-one".