6135661985 has 16 divisors (see below), whose sum is σ = 7409525760. Its totient is φ = 4877421120.

The previous prime is 6135661957. The next prime is 6135662009. The reversal of 6135661985 is 5891665316.

It is not a de Polignac number, because 6135661985 - 2¹² = 6135657889 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, 1647956 + ... + 1651674.

It is an arithmetic number, because the mean of its divisors is an integer number (463095360).

Almost surely, 2^6135661985 is an apocalyptic number.

It is an amenable number.

6135661985 is a deficient number, since it is larger than the sum of its proper divisors (1273863775).

6135661985 is a wasteful number, since it uses less digits than its factorization.

6135661985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728.

The product of its digits is 1166400, while the sum is 50.

The square root of 6135661985 is about 78330.4665184627. The cubic root of 6135661985 is about 1830.7138848337.

The spelling of 6135661985 in words is "six billion, one hundred thirty-five million, six hundred sixty-one thousand, nine hundred eighty-five".