1985642564196 has 24 divisors (see below), whose sum is σ = 4633435226560. Its totient is φ = 661842391392.

The previous prime is 1985642564179. The next prime is 1985642564197. The reversal of 1985642564196 is 6914652465891.

It is a super-2 number, since 2×1985642564196² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1985642564197) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4592431 + ... + 5006166.

Almost surely, 2^{1985642564196} is an apocalyptic number.

It is an amenable number.

1985642564196 is an abundant number, since it is smaller than the sum of its proper divisors (2647792662364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985642564196 is a wasteful number, since it uses less digits than its factorization.

1985642564196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9615843 (or 9615841 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 66.

The spelling of 1985642564196 in words is "one trillion, nine hundred eighty-five billion, six hundred forty-two million, five hundred sixty-four thousand, one hundred ninety-six".