55668919 has 4 divisors (see below), whose sum is σ = 56612520. Its totient is φ = 54725320.

The previous prime is 55668913. The next prime is 55668923. The reversal of 55668919 is 91986655.

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 55668919 - 2⁵ = 55668887 is a prime.

It is a super-2 number, since 2×55668919² = 6198057085257122, which contains 22 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 (55668913) 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, 471712 + ... + 471829.

It is an arithmetic number, because the mean of its divisors is an integer number (14153130).

Almost surely, 2^55668919 is an apocalyptic number.

55668919 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

55668919 is a deficient number, since it is larger than the sum of its proper divisors (943601).

55668919 is an equidigital number, since it uses as much as digits as its factorization.

55668919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943600.

The product of its digits is 583200, while the sum is 49.

The square root of 55668919 is about 7461.1607005881. The cubic root of 55668919 is about 381.8307753508.

The spelling of 55668919 in words is "fifty-five million, six hundred sixty-eight thousand, nine hundred nineteen".