55779447789 has 12 divisors (see below), whose sum is σ = 86768030076. Its totient is φ = 34325813952.

The previous prime is 55779447781. The next prime is 55779447827. The reversal of 55779447789 is 98774497755.

55779447789 is a `hidden beast` number, since 5 + 5 + 7 + 79 + 4 + 477 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5059903689 + 50719544100 = 71133^2 + 225210^2 .

It is not a de Polignac number, because 55779447789 - 2³ = 55779447781 is a prime.

It is a super-2 number, since 2×55779447789² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55779447781) 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, 238373592 + ... + 238373825.

It is an arithmetic number, because the mean of its divisors is an integer number (7230669173).

Almost surely, 2^55779447789 is an apocalyptic number.

It is an amenable number.

55779447789 is a deficient number, since it is larger than the sum of its proper divisors (30988582287).

55779447789 is a wasteful number, since it uses less digits than its factorization.

55779447789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476747436 (or 476747433 counting only the distinct ones).

The product of its digits is 622339200, while the sum is 72.

The spelling of 55779447789 in words is "fifty-five billion, seven hundred seventy-nine million, four hundred forty-seven thousand, seven hundred eighty-nine".