9927136985 has 16 divisors (see below), whose sum is σ = 12165739920. Its totient is φ = 7774694400.

The previous prime is 9927136909. The next prime is 9927137009. The reversal of 9927136985 is 5896317299.

It can be written as a sum of positive squares in 8 ways, for example, as 1214034649 + 8713102336 = 34843^2 + 93344^2 .

It is not a de Polignac number, because 9927136985 - 2¹² = 9927132889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65492 + ... + 155381.

It is an arithmetic number, because the mean of its divisors is an integer number (760358745).

Almost surely, 2^9927136985 is an apocalyptic number.

It is an amenable number.

9927136985 is a deficient number, since it is larger than the sum of its proper divisors (2238602935).

9927136985 is a wasteful number, since it uses less digits than its factorization.

9927136985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221068.

The product of its digits is 7348320, while the sum is 59.

The square root of 9927136985 is about 99635.0188688696. The cubic root of 9927136985 is about 2149.1893092819.

The spelling of 9927136985 in words is "nine billion, nine hundred twenty-seven million, one hundred thirty-six thousand, nine hundred eighty-five".