199726985085 has 64 divisors (see below), whose sum is σ = 324589724928. Its totient is φ = 104862449664.

The previous prime is 199726985071. The next prime is 199726985099. The reversal of 199726985085 is 580589627991.

It is an interprime number because it is at equal distance from previous prime (199726985071) and next prime (199726985099).

It is not a de Polignac number, because 199726985085 - 2⁴ = 199726985069 is a prime.

It is a super-2 number, since 2×199726985085² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 171733714 + ... + 171734876.

It is an arithmetic number, because the mean of its divisors is an integer number (5071714452).

Almost surely, 2^199726985085 is an apocalyptic number.

199726985085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199726985085 is a deficient number, since it is larger than the sum of its proper divisors (124862739843).

199726985085 is a wasteful number, since it uses less digits than its factorization.

199726985085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934.

The product of its (nonzero) digits is 97977600, while the sum is 69.

It can be divided in two parts, 199726 and 985085, that added together give a palindrome (1184811).

The spelling of 199726985085 in words is "one hundred ninety-nine billion, seven hundred twenty-six million, nine hundred eighty-five thousand, eighty-five".