55666491 has 8 divisors (see below), whose sum is σ = 74266944. Its totient is φ = 37088520.

The previous prime is 55666489. The next prime is 55666493. The reversal of 55666491 is 19466655.

It is an interprime number because it is at equal distance from previous prime (55666489) and next prime (55666493).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55666491 - 2¹ = 55666489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55666493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1420 + ... + 10646.

It is an arithmetic number, because the mean of its divisors is an integer number (9283368).

Almost surely, 2^55666491 is an apocalyptic number.

55666491 is a deficient number, since it is larger than the sum of its proper divisors (18600453).

55666491 is a wasteful number, since it uses less digits than its factorization.

55666491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11241.

The product of its digits is 194400, while the sum is 42.

The square root of 55666491 is about 7460.9979895454. The cubic root of 55666491 is about 381.8252240868.

The spelling of 55666491 in words is "fifty-five million, six hundred sixty-six thousand, four hundred ninety-one".