99986555 has 12 divisors (see below), whose sum is σ = 120968400. Its totient is φ = 79336224.

The previous prime is 99986539. The next prime is 99986597. The reversal of 99986555 is 55568999.

It is not a de Polignac number, because 99986555 - 2⁴ = 99986539 is a prime.

It is a super-2 number, since 2×99986555² = 19994622361536050, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99986555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 315257 + ... + 315573.

It is an arithmetic number, because the mean of its divisors is an integer number (10080700).

Almost surely, 2^99986555 is an apocalyptic number.

99986555 is a deficient number, since it is larger than the sum of its proper divisors (20981845).

99986555 is an equidigital number, since it uses as much as digits as its factorization.

99986555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 521 counting only the distinct ones).

The product of its digits is 4374000, while the sum is 56.

The square root of 99986555 is about 9999.3277274025. The cubic root of 99986555 is about 464.1380803750.

The spelling of 99986555 in words is "ninety-nine million, nine hundred eighty-six thousand, five hundred fifty-five".