55666172468 has 24 divisors (see below), whose sum is σ = 98527834440. Its totient is φ = 27515473920.

The previous prime is 55666172467. The next prime is 55666172489. The reversal of 55666172468 is 86427166655.

It can be written as a sum of positive squares in 4 ways, for example, as 9074086564 + 46592085904 = 95258^2 + 215852^2 .

It is a super-2 number, since 2×55666172468² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666172467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792858 + ... + 2812718.

It is an arithmetic number, because the mean of its divisors is an integer number (4105326435).

Almost surely, 2^55666172468 is an apocalyptic number.

It is an amenable number.

55666172468 is a deficient number, since it is larger than the sum of its proper divisors (42861661972).

55666172468 is a wasteful number, since it uses less digits than its factorization.

55666172468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27827 (or 27825 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 56.

The spelling of 55666172468 in words is "fifty-five billion, six hundred sixty-six million, one hundred seventy-two thousand, four hundred sixty-eight".