77117871854 has 4 divisors (see below), whose sum is σ = 115676807784. Its totient is φ = 38558935926.

The previous prime is 77117871829. The next prime is 77117871863. The reversal of 77117871854 is 45817871177.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 77117871854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19279467962 + ... + 19279467965.

It is an arithmetic number, because the mean of its divisors is an integer number (28919201946).

Almost surely, 2^77117871854 is an apocalyptic number.

77117871854 is a deficient number, since it is larger than the sum of its proper divisors (38558935930).

77117871854 is a wasteful number, since it uses less digits than its factorization.

77117871854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38558935929.

The product of its digits is 3073280, while the sum is 56.

The spelling of 77117871854 in words is "seventy-seven billion, one hundred seventeen million, eight hundred seventy-one thousand, eight hundred fifty-four".