55661718 has 32 divisors (see below), whose sum is σ = 127491840. Its totient is φ = 15870240.

The previous prime is 55661699. The next prime is 55661719. The reversal of 55661718 is 81716655.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55661719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24928 + ... + 27068.

It is an arithmetic number, because the mean of its divisors is an integer number (3984120).

Almost surely, 2^55661718 is an apocalyptic number.

55661718 is an abundant number, since it is smaller than the sum of its proper divisors (71830122).

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

55661718 is a wasteful number, since it uses less digits than its factorization.

55661718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772.

The product of its digits is 50400, while the sum is 39.

The square root of 55661718 is about 7460.6781193133. The cubic root of 55661718 is about 381.8143108554.

The spelling of 55661718 in words is "fifty-five million, six hundred sixty-one thousand, seven hundred eighteen".