55685186642 has 6 divisors (see below), whose sum is σ = 83528280549. Its totient is φ = 27842426460.

The previous prime is 55685186597. The next prime is 55685186659. The reversal of 55685186642 is 24668158655.

It can be written as a sum of positive squares in 2 ways, for example, as 39740821201 + 15944365441 = 199351^2 + 126271^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=166861.

It is a super-2 number, since 2×55685186642² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 250292 + ... + 417152.

Almost surely, 2^55685186642 is an apocalyptic number.

55685186642 is a deficient number, since it is larger than the sum of its proper divisors (27843093907).

55685186642 is an frugal number, since it uses more digits than its factorization.

55685186642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333724 (or 166863 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 56.

The spelling of 55685186642 in words is "fifty-five billion, six hundred eighty-five million, one hundred eighty-six thousand, six hundred forty-two".