1985639656364 has 24 divisors (see below), whose sum is σ = 4276762337568. Its totient is φ = 785527776000.

The previous prime is 1985639656321. The next prime is 1985639656367. The reversal of 1985639656364 is 4636569365891.

It is not an unprimeable number, because it can be changed into a prime (1985639656367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2727526637 + ... + 2727527364.

It is an arithmetic number, because the mean of its divisors is an integer number (178198430732).

Almost surely, 2^{1985639656364} is an apocalyptic number.

1985639656364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1985639656364 is an abundant number, since it is smaller than the sum of its proper divisors (2291122681204).

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

1985639656364 is a wasteful number, since it uses less digits than its factorization.

1985639656364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455054025 (or 5455054023 counting only the distinct ones).

The product of its digits is 755827200, while the sum is 71.

The spelling of 1985639656364 in words is "one trillion, nine hundred eighty-five billion, six hundred thirty-nine million, six hundred fifty-six thousand, three hundred sixty-four".