61777478768 has 20 divisors (see below), whose sum is σ = 119700430200. Its totient is φ = 30887045184.

The previous prime is 61777478747. The next prime is 61777478773. The reversal of 61777478768 is 86787477716.

It is a junction number, because it is equal to n+sod(n) for n = 61777478698 and 61777478707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226571 + ... + 418197.

It is an arithmetic number, because the mean of its divisors is an integer number (5985021510).

Almost surely, 2^61777478768 is an apocalyptic number.

It is an amenable number.

61777478768 is a deficient number, since it is larger than the sum of its proper divisors (57922951432).

61777478768 is a wasteful number, since it uses less digits than its factorization.

61777478768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211784 (or 211778 counting only the distinct ones).

The product of its digits is 154893312, while the sum is 68.

The spelling of 61777478768 in words is "sixty-one billion, seven hundred seventy-seven million, four hundred seventy-eight thousand, seven hundred sixty-eight".