55646661 has 48 divisors (see below), whose sum is σ = 92306304. Its totient is φ = 29193216.

The previous prime is 55646653. The next prime is 55646663. The reversal of 55646661 is 16664655.

It is not a de Polignac number, because 55646661 - 2³ = 55646653 is a prime.

Its product of digits (129600) is a multiple of the sum of its prime factors (270).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55646663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 321571 + ... + 321743.

It is an arithmetic number, because the mean of its divisors is an integer number (1923048).

Almost surely, 2^55646661 is an apocalyptic number.

55646661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55646661 is a deficient number, since it is larger than the sum of its proper divisors (36659643).

55646661 is a wasteful number, since it uses less digits than its factorization.

55646661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 253 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 55646661 is about 7459.6689604834. The cubic root of 55646661 is about 381.7798796716.

The spelling of 55646661 in words is "fifty-five million, six hundred forty-six thousand, six hundred sixty-one".