55688390066 has 8 divisors (see below), whose sum is σ = 83686990764. Its totient is φ = 27792726480.

The previous prime is 55688390057. The next prime is 55688390071. The reversal of 55688390066 is 66009388655.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 52932665041 + 2755725025 = 230071^2 + 52495^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 55688389993 and 55688390020.

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, 25732925 + ... + 25735088.

Almost surely, 2^55688390066 is an apocalyptic number.

55688390066 is a deficient number, since it is larger than the sum of its proper divisors (27998600698).

55688390066 is a wasteful number, since it uses less digits than its factorization.

55688390066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51468556.

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 55688390066 in words is "fifty-five billion, six hundred eighty-eight million, three hundred ninety thousand, sixty-six".