66371722 has 4 divisors (see below), whose sum is σ = 99557586. Its totient is φ = 33185860.

The previous prime is 66371719. The next prime is 66371729. The reversal of 66371722 is 22717366.

It is a happy number.

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., 51710481 + 14661241 = 7191^2 + 3829^2 .

It is not an unprimeable number, because it can be changed into a prime (66371729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16592929 + ... + 16592932.

Almost surely, 2^66371722 is an apocalyptic number.

66371722 is a deficient number, since it is larger than the sum of its proper divisors (33185864).

66371722 is a wasteful number, since it uses less digits than its factorization.

66371722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33185863.

The product of its digits is 21168, while the sum is 34.

The square root of 66371722 is about 8146.8841896764. The cubic root of 66371722 is about 404.8812780092.

The spelling of 66371722 in words is "sixty-six million, three hundred seventy-one thousand, seven hundred twenty-two".