8199972761 has 4 divisors (see below), whose sum is σ = 8200159332. Its totient is φ = 8199786192.

The previous prime is 8199972743. The next prime is 8199972773. The reversal of 8199972761 is 1672799918.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3846480400 + 4353492361 = 62020^2 + 65981^2 .

It is a cyclic number.

It is not a de Polignac number, because 8199972761 - 2¹⁴ = 8199956377 is a prime.

It is a super-2 number, since 2×8199972761² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8199972761.

It is not an unprimeable number, because it can be changed into a prime (8199972721) by changing a digit.

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, 13031 + ... + 128723.

It is an arithmetic number, because the mean of its divisors is an integer number (2050039833).

Almost surely, 2^8199972761 is an apocalyptic number.

It is an amenable number.

8199972761 is a deficient number, since it is larger than the sum of its proper divisors (186571).

8199972761 is a wasteful number, since it uses less digits than its factorization.

8199972761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186570.

The product of its digits is 3429216, while the sum is 59.

The square root of 8199972761 is about 90553.7009790323. The cubic root of 8199972761 is about 2016.5274423599.

The spelling of 8199972761 in words is "eight billion, one hundred ninety-nine million, nine hundred seventy-two thousand, seven hundred sixty-one".