77138223671 has 4 divisors (see below), whose sum is σ = 81198130200. Its totient is φ = 73078317144.

The previous prime is 77138223667. The next prime is 77138223713. The reversal of 77138223671 is 17632283177.

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

It is a cyclic number.

It is not a de Polignac number, because 77138223671 - 2² = 77138223667 is a prime.

It is a super-2 number, since 2×77138223671² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77138223661) 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, 2029953236 + ... + 2029953273.

It is an arithmetic number, because the mean of its divisors is an integer number (20299532550).

Almost surely, 2^77138223671 is an apocalyptic number.

77138223671 is a deficient number, since it is larger than the sum of its proper divisors (4059906529).

77138223671 is a wasteful number, since it uses less digits than its factorization.

77138223671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059906528.

The product of its digits is 592704, while the sum is 47.

The spelling of 77138223671 in words is "seventy-seven billion, one hundred thirty-eight million, two hundred twenty-three thousand, six hundred seventy-one".