66236251 has 4 divisors (see below), whose sum is σ = 69116112. Its totient is φ = 63356392.

The previous prime is 66236239. The next prime is 66236257. The reversal of 66236251 is 15263266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15263266 = 2 ⋅7631633.

It is a cyclic number.

It is not a de Polignac number, because 66236251 - 2⁷ = 66236123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66236257) 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, 1439896 + ... + 1439941.

It is an arithmetic number, because the mean of its divisors is an integer number (17279028).

Almost surely, 2^66236251 is an apocalyptic number.

66236251 is a deficient number, since it is larger than the sum of its proper divisors (2879861).

66236251 is a wasteful number, since it uses less digits than its factorization.

66236251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879860.

The product of its digits is 12960, while the sum is 31.

The square root of 66236251 is about 8138.5656598691. The cubic root of 66236251 is about 404.6056233070.

The spelling of 66236251 in words is "sixty-six million, two hundred thirty-six thousand, two hundred fifty-one".