7821663598995 has 16 divisors (see below), whose sum is σ = 12805700404992. Its totient is φ = 4074541037280.

The previous prime is 7821663598891. The next prime is 7821663599041. The reversal of 7821663598995 is 5998953661287.

It is a happy number.

It is not a de Polignac number, because 7821663598995 - 2⁷ = 7821663598867 is a prime.

It is a super-2 number, since 2×7821663598995² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7821663598995.

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, 6063304471 + ... + 6063305760.

It is an arithmetic number, because the mean of its divisors is an integer number (800356275312).

Almost surely, 2^{7821663598995} is an apocalyptic number.

7821663598995 is a deficient number, since it is larger than the sum of its proper divisors (4984036805997).

7821663598995 is a wasteful number, since it uses less digits than its factorization.

7821663598995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12126610282.

The product of its digits is 1763596800, while the sum is 78.

The spelling of 7821663598995 in words is "seven trillion, eight hundred twenty-one billion, six hundred sixty-three million, five hundred ninety-eight thousand, nine hundred ninety-five".