7971895205 has 8 divisors (see below), whose sum is σ = 9568419192. Its totient is φ = 6376086208.

The previous prime is 7971895193. The next prime is 7971895213. The reversal of 7971895205 is 5025981797.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1088538049 + 6883357156 = 32993^2 + 82966^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7971895205 - 2²⁶ = 7904786341 is a prime.

It is a super-2 number, since 2×7971895205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153902 + ... + 199071.

It is an arithmetic number, because the mean of its divisors is an integer number (1196052399).

Almost surely, 2^7971895205 is an apocalyptic number.

It is an amenable number.

7971895205 is a deficient number, since it is larger than the sum of its proper divisors (1596523987).

7971895205 is a wasteful number, since it uses less digits than its factorization.

7971895205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357495.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The square root of 7971895205 is about 89285.4702905238. The cubic root of 7971895205 is about 1997.6551857474.

The spelling of 7971895205 in words is "seven billion, nine hundred seventy-one million, eight hundred ninety-five thousand, two hundred five".