6891972722 has 4 divisors (see below), whose sum is σ = 10337959086. Its totient is φ = 3445986360.

The previous prime is 6891972709. The next prime is 6891972727. The reversal of 6891972722 is 2272791986.

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

It can be written as a sum of positive squares in only one way, i.e., 5602372801 + 1289599921 = 74849^2 + 35911^2 .

It is not an unprimeable number, because it can be changed into a prime (6891972727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1722993179 + ... + 1722993182.

Almost surely, 2^6891972722 is an apocalyptic number.

6891972722 is a deficient number, since it is larger than the sum of its proper divisors (3445986364).

6891972722 is a wasteful number, since it uses less digits than its factorization.

6891972722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445986363.

The product of its digits is 1524096, while the sum is 53.

The square root of 6891972722 is about 83017.9060323735. The cubic root of 6891972722 is about 1903.0397070126.

The spelling of 6891972722 in words is "six billion, eight hundred ninety-one million, nine hundred seventy-two thousand, seven hundred twenty-two".