78877772742355 has 4 divisors (see below), whose sum is σ = 94653327290832. Its totient is φ = 63102218193880.

The previous prime is 78877772742337. The next prime is 78877772742427. The reversal of 78877772742355 is 55324727777887.

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

It is not a de Polignac number, because 78877772742355 - 2²⁹ = 78877235871443 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7887777274231 + ... + 7887777274240.

It is an arithmetic number, because the mean of its divisors is an integer number (23663331822708).

Almost surely, 2^{78877772742355} is an apocalyptic number.

78877772742355 is a deficient number, since it is larger than the sum of its proper divisors (15775554548477).

78877772742355 is a wasteful number, since it uses less digits than its factorization.

78877772742355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15775554548476.

The product of its digits is 9035443200, while the sum is 79.

The spelling of 78877772742355 in words is "seventy-eight trillion, eight hundred seventy-seven billion, seven hundred seventy-two million, seven hundred forty-two thousand, three hundred fifty-five".