7821066195 has 24 divisors (see below), whose sum is σ = 13576592016. Its totient is φ = 4165057728.

The previous prime is 7821066193. The next prime is 7821066203. The reversal of 7821066195 is 5916601287.

7821066195 is a `hidden beast` number, since 7 + 8 + 21 + 0 + 6 + 619 + 5 = 666.

It is not a de Polignac number, because 7821066195 - 2¹ = 7821066193 is a prime.

It is a super-2 number, since 2×7821066195² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7821066195.

It is not an unprimeable number, because it can be changed into a prime (7821066193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97897 + ... + 158826.

It is an arithmetic number, because the mean of its divisors is an integer number (565691334).

Almost surely, 2^7821066195 is an apocalyptic number.

7821066195 is a deficient number, since it is larger than the sum of its proper divisors (5755525821).

7821066195 is a wasteful number, since it uses less digits than its factorization.

7821066195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257411 (or 257408 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 7821066195 is about 88436.7920890395. The cubic root of 7821066195 is about 1984.9762760289.

The spelling of 7821066195 in words is "seven billion, eight hundred twenty-one million, sixty-six thousand, one hundred ninety-five".