77734617725778 has 16 divisors (see below), whose sum is σ = 167428407409536. Its totient is φ = 23918343915600.

The previous prime is 77734617725731. The next prime is 77734617725789. The reversal of 77734617725778 is 87752771643777.

It is a Harshad number since it is a multiple of its sum of digits (78), and also a Moran number because the ratio is a prime number: 996597663151 = 77734617725778 / (7 + 7 + 7 + 3 + 4 + 6 + 1 + 7 + 7 + 2 + 5 + 7 + 7 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498298831498 + ... + 498298831653.

It is an arithmetic number, because the mean of its divisors is an integer number (10464275463096).

Almost surely, 2^{77734617725778} is an apocalyptic number.

77734617725778 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

77734617725778 is an abundant number, since it is smaller than the sum of its proper divisors (89693789683758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77734617725778 is a wasteful number, since it uses less digits than its factorization.

77734617725778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996597663169.

The product of its digits is 4743607680, while the sum is 78.

The spelling of 77734617725778 in words is "seventy-seven trillion, seven hundred thirty-four billion, six hundred seventeen million, seven hundred twenty-five thousand, seven hundred seventy-eight".