55561718 has 8 divisors (see below), whose sum is σ = 83824848. Its totient is φ = 27620104.

The previous prime is 55561711. The next prime is 55561733. The reversal of 55561718 is 81716555.

It is a happy number.

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

It is a super-2 number, since 2×55561718² = 6174209014223048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79946 + ... + 80637.

It is an arithmetic number, because the mean of its divisors is an integer number (10478106).

Almost surely, 2^55561718 is an apocalyptic number.

55561718 is a deficient number, since it is larger than the sum of its proper divisors (28263130).

55561718 is a wasteful number, since it uses less digits than its factorization.

55561718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160758.

The product of its digits is 42000, while the sum is 38.

The square root of 55561718 is about 7453.9733028768. The cubic root of 55561718 is about 381.5855221387.

The spelling of 55561718 in words is "fifty-five million, five hundred sixty-one thousand, seven hundred eighteen".