77144431723 has 4 divisors (see below), whose sum is σ = 77151907888. Its totient is φ = 77136955560.

The previous prime is 77144431703. The next prime is 77144431781. The reversal of 77144431723 is 32713444177.

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: 32713444177 = 7673 ⋅4263449.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77144431723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77144431723.

It is not an unprimeable number, because it can be changed into a prime (77144431703) 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, 3722583 + ... + 3743248.

It is an arithmetic number, because the mean of its divisors is an integer number (19287976972).

Almost surely, 2^77144431723 is an apocalyptic number.

77144431723 is a deficient number, since it is larger than the sum of its proper divisors (7476165).

77144431723 is a wasteful number, since it uses less digits than its factorization.

77144431723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7476164.

The product of its digits is 395136, while the sum is 43.

The spelling of 77144431723 in words is "seventy-seven billion, one hundred forty-four million, four hundred thirty-one thousand, seven hundred twenty-three".