55520658666 has 48 divisors (see below), whose sum is σ = 138950106048. Its totient is φ = 15834768000.

The previous prime is 55520658553. The next prime is 55520658671. The reversal of 55520658666 is 66685602555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8243910 + ... + 8250641.

It is an arithmetic number, because the mean of its divisors is an integer number (2894793876).

Almost surely, 2^55520658666 is an apocalyptic number.

55520658666 is an abundant number, since it is smaller than the sum of its proper divisors (83429447382).

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

55520658666 is a wasteful number, since it uses less digits than its factorization.

55520658666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16494587 (or 16494584 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 55520658666 in words is "fifty-five billion, five hundred twenty million, six hundred fifty-eight thousand, six hundred sixty-six".