55319666 has 16 divisors (see below), whose sum is σ = 88923744. Its totient is φ = 25717824.

The previous prime is 55319633. The next prime is 55319687. The reversal of 55319666 is 66691355.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6980 + ... + 12623.

It is an arithmetic number, because the mean of its divisors is an integer number (5557734).

Almost surely, 2^55319666 is an apocalyptic number.

55319666 is a deficient number, since it is larger than the sum of its proper divisors (33604078).

55319666 is a wasteful number, since it uses less digits than its factorization.

55319666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19705.

The product of its digits is 145800, while the sum is 41.

The square root of 55319666 is about 7437.7191396288. The cubic root of 55319666 is about 381.0305957523.

The spelling of 55319666 in words is "fifty-five million, three hundred nineteen thousand, six hundred sixty-six".