55131681986 has 8 divisors (see below), whose sum is σ = 82798253244. Its totient is φ = 27532264240.

The previous prime is 55131681947. The next prime is 55131682031. The reversal of 55131681986 is 68918613155.

It can be written as a sum of positive squares in 2 ways, for example, as 47399821225 + 7731860761 = 217715^2 + 87931^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16786325 + ... + 16789608.

Almost surely, 2^55131681986 is an apocalyptic number.

55131681986 is a deficient number, since it is larger than the sum of its proper divisors (27666571258).

55131681986 is a wasteful number, since it uses less digits than its factorization.

55131681986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33576756.

The product of its digits is 1555200, while the sum is 53.

The spelling of 55131681986 in words is "fifty-five billion, one hundred thirty-one million, six hundred eighty-one thousand, nine hundred eighty-six".