66948251 has 4 divisors (see below), whose sum is σ = 69107904. Its totient is φ = 64788600.

The previous prime is 66948241. The next prime is 66948253. The reversal of 66948251 is 15284966.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66948251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66948199 and 66948208.

It is not an unprimeable number, because it can be changed into a prime (66948253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079780 + ... + 1079841.

It is an arithmetic number, because the mean of its divisors is an integer number (17276976).

Almost surely, 2^66948251 is an apocalyptic number.

66948251 is a deficient number, since it is larger than the sum of its proper divisors (2159653).

66948251 is a wasteful number, since it uses less digits than its factorization.

66948251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159652.

The product of its digits is 103680, while the sum is 41.

The square root of 66948251 is about 8182.1910879666. The cubic root of 66948251 is about 406.0502154234.

The spelling of 66948251 in words is "sixty-six million, nine hundred forty-eight thousand, two hundred fifty-one".