66662251 has 4 divisors (see below), whose sum is σ = 66711904. Its totient is φ = 66612600.

The previous prime is 66662237. The next prime is 66662261. The reversal of 66662251 is 15226666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66662251 - 2¹¹ = 66660203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66662221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22755 + ... + 25516.

It is an arithmetic number, because the mean of its divisors is an integer number (16677976).

Almost surely, 2^66662251 is an apocalyptic number.

66662251 is a deficient number, since it is larger than the sum of its proper divisors (49653).

66662251 is a wasteful number, since it uses less digits than its factorization.

66662251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49652.

The product of its digits is 25920, while the sum is 34.

The square root of 66662251 is about 8164.6954015444. The cubic root of 66662251 is about 405.4711805150.

The spelling of 66662251 in words is "sixty-six million, six hundred sixty-two thousand, two hundred fifty-one".