55657661 has 4 divisors (see below), whose sum is σ = 55709952. Its totient is φ = 55605372.

The previous prime is 55657649. The next prime is 55657687. The reversal of 55657661 is 16675655.

55657661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55657661 - 2¹⁴ = 55641277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55657601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24515 + ... + 26688.

It is an arithmetic number, because the mean of its divisors is an integer number (13927488).

Almost surely, 2^55657661 is an apocalyptic number.

It is an amenable number.

55657661 is a deficient number, since it is larger than the sum of its proper divisors (52291).

55657661 is a wasteful number, since it uses less digits than its factorization.

55657661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52290.

The product of its digits is 189000, while the sum is 41.

The square root of 55657661 is about 7460.4062221839. The cubic root of 55657661 is about 381.8050342326.

The spelling of 55657661 in words is "fifty-five million, six hundred fifty-seven thousand, six hundred sixty-one".