55720778346 has 24 divisors (see below), whose sum is σ = 120732770340. Its totient is φ = 18572913216.

The previous prime is 55720778341. The next prime is 55720778359. The reversal of 55720778346 is 64387702755.

It is a happy number.

55720778346 is a `hidden beast` number, since 557 + 2 + 0 + 7 + 7 + 83 + 4 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 45641622321 + 10079156025 = 213639^2 + 100395^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55720778292 and 55720778301.

It is not an unprimeable number, because it can be changed into a prime (55720778341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 795720 + ... + 862908.

Almost surely, 2^55720778346 is an apocalyptic number.

55720778346 is an abundant number, since it is smaller than the sum of its proper divisors (65011991994).

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

55720778346 is a wasteful number, since it uses less digits than its factorization.

55720778346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113270 (or 113267 counting only the distinct ones).

The product of its (nonzero) digits is 9878400, while the sum is 54.

The spelling of 55720778346 in words is "fifty-five billion, seven hundred twenty million, seven hundred seventy-eight thousand, three hundred forty-six".