7868121995 has 4 divisors (see below), whose sum is σ = 9441746400. Its totient is φ = 6294497592.

The previous prime is 7868121907. The next prime is 7868122021. The reversal of 7868121995 is 5991218687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7868121995 - 2¹⁰ = 7868120971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7868121995.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 786812195 + ... + 786812204.

It is an arithmetic number, because the mean of its divisors is an integer number (2360436600).

Almost surely, 2^7868121995 is an apocalyptic number.

7868121995 is a deficient number, since it is larger than the sum of its proper divisors (1573624405).

7868121995 is a wasteful number, since it uses less digits than its factorization.

7868121995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573624404.

The product of its digits is 2177280, while the sum is 56.

The square root of 7868121995 is about 88702.4351131354. The cubic root of 7868121995 is about 1988.9492188276.

The spelling of 7868121995 in words is "seven billion, eight hundred sixty-eight million, one hundred twenty-one thousand, nine hundred ninety-five".