6645834193 has 6 divisors (see below), whose sum is σ = 7014024834. Its totient is φ = 6296053104.

The previous prime is 6645834187. The next prime is 6645834211. The reversal of 6645834193 is 3914385466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5027944464 + 1617889729 = 70908^2 + 40223^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6645834193 is a prime.

It is a super-2 number, since 2×6645834193² = 88334224241695922498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645834103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9204396 + ... + 9205117.

It is an arithmetic number, because the mean of its divisors is an integer number (1169004139).

Almost surely, 2^6645834193 is an apocalyptic number.

It is an amenable number.

6645834193 is a deficient number, since it is larger than the sum of its proper divisors (368190641).

6645834193 is a wasteful number, since it uses less digits than its factorization.

6645834193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18409551 (or 18409532 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The square root of 6645834193 is about 81521.9859485771. The cubic root of 6645834193 is about 1880.1096013702.

The spelling of 6645834193 in words is "six billion, six hundred forty-five million, eight hundred thirty-four thousand, one hundred ninety-three".