77242693739 has 4 divisors (see below), whose sum is σ = 81786381624. Its totient is φ = 72699005856.

The previous prime is 77242693733. The next prime is 77242693753. The reversal of 77242693739 is 93739624277.

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-77242693739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77242693733) 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, 2271843917 + ... + 2271843950.

It is an arithmetic number, because the mean of its divisors is an integer number (20446595406).

Almost surely, 2^77242693739 is an apocalyptic number.

77242693739 is a deficient number, since it is larger than the sum of its proper divisors (4543687885).

77242693739 is a wasteful number, since it uses less digits than its factorization.

77242693739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543687884.

The product of its digits is 24004512, while the sum is 59.

The spelling of 77242693739 in words is "seventy-seven billion, two hundred forty-two million, six hundred ninety-three thousand, seven hundred thirty-nine".