55666783 has 4 divisors (see below), whose sum is σ = 55721808. Its totient is φ = 55611760.

The previous prime is 55666771. The next prime is 55666813. The reversal of 55666783 is 38766655.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55666783 - 2¹³ = 55658591 is a prime.

It is a super-3 number, since 3×55666783³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666763) 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, 25966 + ... + 28027.

It is an arithmetic number, because the mean of its divisors is an integer number (13930452).

Almost surely, 2^55666783 is an apocalyptic number.

55666783 is a deficient number, since it is larger than the sum of its proper divisors (55025).

55666783 is a wasteful number, since it uses less digits than its factorization.

55666783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55024.

The product of its digits is 907200, while the sum is 46.

The square root of 55666783 is about 7461.0175579474. The cubic root of 55666783 is about 381.8258917103.

The spelling of 55666783 in words is "fifty-five million, six hundred sixty-six thousand, seven hundred eighty-three".