77318879255 has 4 divisors (see below), whose sum is σ = 92782655112. Its totient is φ = 61855103400.

The previous prime is 77318879249. The next prime is 77318879257. The reversal of 77318879255 is 55297881377.

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

It is not a de Polignac number, because 77318879255 - 2⁶ = 77318879191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77318879257) 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, 7731887921 + ... + 7731887930.

It is an arithmetic number, because the mean of its divisors is an integer number (23195663778).

Almost surely, 2^77318879255 is an apocalyptic number.

77318879255 is a deficient number, since it is larger than the sum of its proper divisors (15463775857).

77318879255 is a wasteful number, since it uses less digits than its factorization.

77318879255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15463775856.

The product of its digits is 29635200, while the sum is 62.

The spelling of 77318879255 in words is "seventy-seven billion, three hundred eighteen million, eight hundred seventy-nine thousand, two hundred fifty-five".