77279762242 has 4 divisors (see below), whose sum is σ = 115919643366. Its totient is φ = 38639881120.

The previous prime is 77279762227. The next prime is 77279762297. The reversal of 77279762242 is 24226797277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24226797277 = 1091 ⋅22206047.

It can be written as a sum of positive squares in only one way, i.e., 48501693361 + 28778068881 = 220231^2 + 169641^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19319940559 + ... + 19319940562.

Almost surely, 2^77279762242 is an apocalyptic number.

77279762242 is a deficient number, since it is larger than the sum of its proper divisors (38639881124).

77279762242 is a wasteful number, since it uses less digits than its factorization.

77279762242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38639881123.

The product of its digits is 8297856, while the sum is 55.

The spelling of 77279762242 in words is "seventy-seven billion, two hundred seventy-nine million, seven hundred sixty-two thousand, two hundred forty-two".