55129966 has 16 divisors (see below), whose sum is σ = 87183360. Its totient is φ = 26106840.

The previous prime is 55129961. The next prime is 55129967. The reversal of 55129966 is 66992155.

It is a super-2 number, since 2×55129966² = 6078626302322312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55129961) 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, 6546 + ... + 12373.

It is an arithmetic number, because the mean of its divisors is an integer number (5448960).

Almost surely, 2^55129966 is an apocalyptic number.

55129966 is a deficient number, since it is larger than the sum of its proper divisors (32053394).

55129966 is a wasteful number, since it uses less digits than its factorization.

55129966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18999.

The product of its digits is 145800, while the sum is 43.

The square root of 55129966 is about 7424.9556227630. The cubic root of 55129966 is about 380.5945586331.

The spelling of 55129966 in words is "fifty-five million, one hundred twenty-nine thousand, nine hundred sixty-six".