66206722 has 4 divisors (see below), whose sum is σ = 99310086. Its totient is φ = 33103360.

The previous prime is 66206689. The next prime is 66206729. The reversal of 66206722 is 22760266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22760266 = 2 ⋅11380133.

It can be written as a sum of positive squares in only one way, i.e., 45037521 + 21169201 = 6711^2 + 4601^2 .

It is not an unprimeable number, because it can be changed into a prime (66206729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16551679 + ... + 16551682.

Almost surely, 2^66206722 is an apocalyptic number.

66206722 is a deficient number, since it is larger than the sum of its proper divisors (33103364).

66206722 is a wasteful number, since it uses less digits than its factorization.

66206722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33103363.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 66206722 is about 8136.7513173256. The cubic root of 66206722 is about 404.5454881837.

Adding to 66206722 its reverse (22760266), we get a palindrome (88966988).

The spelling of 66206722 in words is "sixty-six million, two hundred six thousand, seven hundred twenty-two".