55660691 has 8 divisors (see below), whose sum is σ = 57300960. Its totient is φ = 54027648.

The previous prime is 55660681. The next prime is 55660697. The reversal of 55660691 is 19606655.

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

It is a cyclic number.

It is not a de Polignac number, because 55660691 - 2¹⁴ = 55644307 is a prime.

It is a super-2 number, since 2×55660691² = 6196225045194962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55660697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16475 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (7162620).

Almost surely, 2^55660691 is an apocalyptic number.

55660691 is a deficient number, since it is larger than the sum of its proper divisors (1640269).

55660691 is a wasteful number, since it uses less digits than its factorization.

55660691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 55660691 is about 7460.6092914721. The cubic root of 55660691 is about 381.8119625885.

The spelling of 55660691 in words is "fifty-five million, six hundred sixty thousand, six hundred ninety-one".