55666494 has 64 divisors (see below), whose sum is σ = 134265600. Its totient is φ = 16994016.

The previous prime is 55666493. The next prime is 55666511. The reversal of 55666494 is 49466655.

Its product of digits (777600) is a multiple of the sum of its prime divisors (640).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125437 + ... + 125879.

It is an arithmetic number, because the mean of its divisors is an integer number (2097900).

Almost surely, 2^55666494 is an apocalyptic number.

55666494 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55666494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67132800).

55666494 is an abundant number, since it is smaller than the sum of its proper divisors (78599106).

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

55666494 is a wasteful number, since it uses less digits than its factorization.

55666494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 640 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 55666494 is about 7460.9981905909. The cubic root of 55666494 is about 381.8252309459.

The spelling of 55666494 in words is "fifty-five million, six hundred sixty-six thousand, four hundred ninety-four".