722166722 has 4 divisors (see below), whose sum is σ = 1083250086. Its totient is φ = 361083360.

The previous prime is 722166691. The next prime is 722166727. The reversal of 722166722 is 227661227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227661227 = 4079 ⋅55813.

It can be written as a sum of positive squares in only one way, i.e., 716686441 + 5480281 = 26771^2 + 2341^2 .

It is not an unprimeable number, because it can be changed into a prime (722166727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180541679 + ... + 180541682.

Almost surely, 2^722166722 is an apocalyptic number.

722166722 is a deficient number, since it is larger than the sum of its proper divisors (361083364).

722166722 is a wasteful number, since it uses less digits than its factorization.

722166722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361083363.

The product of its digits is 28224, while the sum is 35.

The square root of 722166722 is about 26873.1598811900. The cubic root of 722166722 is about 897.1791191569.

The spelling of 722166722 in words is "seven hundred twenty-two million, one hundred sixty-six thousand, seven hundred twenty-two".