66071826 has 24 divisors (see below), whose sum is σ = 151577244. Its totient is φ = 20728320.

The previous prime is 66071821. The next prime is 66071827. The reversal of 66071826 is 62817066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51624225 + 14447601 = 7185^2 + 3801^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66071821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107655 + ... + 108266.

Almost surely, 2^66071826 is an apocalyptic number.

66071826 is an abundant number, since it is smaller than the sum of its proper divisors (85505418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66071826 is a wasteful number, since it uses less digits than its factorization.

66071826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215946 (or 215943 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 66071826 is about 8128.4577873050. The cubic root of 66071826 is about 404.2705479577.

The spelling of 66071826 in words is "sixty-six million, seventy-one thousand, eight hundred twenty-six".