80777288857 has 8 divisors (see below), whose sum is σ = 82760863752. Its totient is φ = 78794352000.

The previous prime is 80777288849. The next prime is 80777288863. The reversal of 80777288857 is 75888277708.

It can be written as a sum of positive squares in 4 ways, for example, as 21161229961 + 59616058896 = 145469^2 + 244164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80777288857 - 2³ = 80777288849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80777288792 and 80777288801.

It is not an unprimeable number, because it can be changed into a prime (80277288857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102003 + ... + 414679.

It is an arithmetic number, because the mean of its divisors is an integer number (10345107969).

Almost surely, 2^80777288857 is an apocalyptic number.

It is an amenable number.

80777288857 is a deficient number, since it is larger than the sum of its proper divisors (1983574895).

80777288857 is a wasteful number, since it uses less digits than its factorization.

80777288857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319019.

The product of its (nonzero) digits is 98344960, while the sum is 67.

The spelling of 80777288857 in words is "eighty billion, seven hundred seventy-seven million, two hundred eighty-eight thousand, eight hundred fifty-seven".