215651342722 has 4 divisors (see below), whose sum is σ = 323477014086. Its totient is φ = 107825671360.

The previous prime is 215651342701. The next prime is 215651342741. The reversal of 215651342722 is 227243156512.

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., 135410016361 + 80241326361 = 367981^2 + 283269^2 .

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 as a sum of consecutive naturals, namely, 53912835679 + ... + 53912835682.

Almost surely, 2^215651342722 is an apocalyptic number.

215651342722 is a deficient number, since it is larger than the sum of its proper divisors (107825671364).

215651342722 is a wasteful number, since it uses less digits than its factorization.

215651342722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107825671363.

The product of its digits is 201600, while the sum is 40.

The spelling of 215651342722 in words is "two hundred fifteen billion, six hundred fifty-one million, three hundred forty-two thousand, seven hundred twenty-two".