55103215666 has 16 divisors (see below), whose sum is σ = 85343735808. Its totient is φ = 26655775200.

The previous prime is 55103215597. The next prime is 55103215669. The reversal of 55103215666 is 66651230155.

It is not an unprimeable number, because it can be changed into a prime (55103215669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121711 + ... + 353581.

It is an arithmetic number, because the mean of its divisors is an integer number (5333983488).

Almost surely, 2^55103215666 is an apocalyptic number.

55103215666 is a deficient number, since it is larger than the sum of its proper divisors (30240520142).

55103215666 is a wasteful number, since it uses less digits than its factorization.

55103215666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235737.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 55103215666 in words is "fifty-five billion, one hundred three million, two hundred fifteen thousand, six hundred sixty-six".