55661610 has 32 divisors (see below), whose sum is σ = 139397760. Its totient is φ = 14197568.

The previous prime is 55661609. The next prime is 55661611. The reversal of 55661610 is 1616655.

It is an interprime number because it is at equal distance from previous prime (55661609) and next prime (55661611).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55661611) 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 15 ways as a sum of consecutive naturals, for example, 39645 + ... + 41024.

It is an arithmetic number, because the mean of its divisors is an integer number (4356180).

Almost surely, 2^55661610 is an apocalyptic number.

55661610 is an abundant number, since it is smaller than the sum of its proper divisors (83736150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55661610 is a wasteful number, since it uses less digits than its factorization.

55661610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80702.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 55661610 is about 7460.6708813618. The cubic root of 55661610 is about 381.8140639115.

The spelling of 55661610 in words is "fifty-five million, six hundred sixty-one thousand, six hundred ten".