77838798971 has 4 divisors (see below), whose sum is σ = 77840272272. Its totient is φ = 77837325672.

The previous prime is 77838798949. The next prime is 77838799019. The reversal of 77838798971 is 17989783877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77838798971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77838798871) 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, 654335 + ... + 764088.

It is an arithmetic number, because the mean of its divisors is an integer number (19460068068).

Almost surely, 2^77838798971 is an apocalyptic number.

77838798971 is a deficient number, since it is larger than the sum of its proper divisors (1473301).

77838798971 is a wasteful number, since it uses less digits than its factorization.

77838798971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473300.

The product of its digits is 298722816, while the sum is 74.

The spelling of 77838798971 in words is "seventy-seven billion, eight hundred thirty-eight million, seven hundred ninety-eight thousand, nine hundred seventy-one".