55661812017986 has 4 divisors (see below), whose sum is σ = 83492718026982. Its totient is φ = 27830906008992.

The previous prime is 55661812017883. The next prime is 55661812018037. The reversal of 55661812017986 is 68971021816655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 43217278780225 + 12444533237761 = 6573985^2 + 3527681^2 .

It is a super-2 number, since 2×55661812017986² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13915453004495 + ... + 13915453004498.

Almost surely, 2^{55661812017986} is an apocalyptic number.

55661812017986 is a deficient number, since it is larger than the sum of its proper divisors (27830906008996).

55661812017986 is a wasteful number, since it uses less digits than its factorization.

55661812017986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27830906008995.

The product of its (nonzero) digits is 43545600, while the sum is 65.

The spelling of 55661812017986 in words is "fifty-five trillion, six hundred sixty-one billion, eight hundred twelve million, seventeen thousand, nine hundred eighty-six".