77147215055 has 16 divisors (see below), whose sum is σ = 95959442880. Its totient is φ = 59471048448.

The previous prime is 77147215027. The next prime is 77147215141. The reversal of 77147215055 is 55051274177.

It is a cyclic number.

It is not a de Polignac number, because 77147215055 - 2²⁰ = 77146166479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77147214997 and 77147215015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455942 + ... + 601811.

It is an arithmetic number, because the mean of its divisors is an integer number (5997465180).

Almost surely, 2^77147215055 is an apocalyptic number.

77147215055 is a deficient number, since it is larger than the sum of its proper divisors (18812227825).

77147215055 is a wasteful number, since it uses less digits than its factorization.

77147215055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058290.

The product of its (nonzero) digits is 343000, while the sum is 44.

The spelling of 77147215055 in words is "seventy-seven billion, one hundred forty-seven million, two hundred fifteen thousand, fifty-five".