55661091 has 8 divisors (see below), whose sum is σ = 74297424. Its totient is φ = 37066080.

The previous prime is 55661087. The next prime is 55661107. The reversal of 55661091 is 19016655.

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

It is not a de Polignac number, because 55661091 - 2² = 55661087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55661041) 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, 7036 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (9287178).

Almost surely, 2^55661091 is an apocalyptic number.

55661091 is a deficient number, since it is larger than the sum of its proper divisors (18636333).

55661091 is a wasteful number, since it uses less digits than its factorization.

55661091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20661.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 55661091 is about 7460.6360988859. The cubic root of 55661091 is about 381.8128772042.

The spelling of 55661091 in words is "fifty-five million, six hundred sixty-one thousand, ninety-one".