55166690 has 16 divisors (see below), whose sum is σ = 104526720. Its totient is φ = 20905200.

The previous prime is 55166687. The next prime is 55166731. The reversal of 55166690 is 9666155.

55166690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55166690² = 6086727371112200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144986 + ... + 145365.

It is an arithmetic number, because the mean of its divisors is an integer number (6532920).

Almost surely, 2^55166690 is an apocalyptic number.

55166690 is a deficient number, since it is larger than the sum of its proper divisors (49360030).

55166690 is a wasteful number, since it uses less digits than its factorization.

55166690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290377.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 55166690 is about 7427.4282224738. The cubic root of 55166690 is about 380.6790489942.

The spelling of 55166690 in words is "fifty-five million, one hundred sixty-six thousand, six hundred ninety".