55666417 has 4 divisors (see below), whose sum is σ = 58086720. Its totient is φ = 53246116.

The previous prime is 55666393. The next prime is 55666427. The reversal of 55666417 is 71466655.

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 55666417 - 2¹⁵ = 55633649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55666417.

It is not an unprimeable number, because it can be changed into a prime (55666427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210117 + ... + 1210162.

It is an arithmetic number, because the mean of its divisors is an integer number (14521680).

Almost surely, 2^55666417 is an apocalyptic number.

It is an amenable number.

55666417 is a deficient number, since it is larger than the sum of its proper divisors (2420303).

55666417 is a wasteful number, since it uses less digits than its factorization.

55666417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420302.

The product of its digits is 151200, while the sum is 40.

The square root of 55666417 is about 7460.9930304216. The cubic root of 55666417 is about 381.8250548941.

The spelling of 55666417 in words is "fifty-five million, six hundred sixty-six thousand, four hundred seventeen".