66307951 has 4 divisors (see below), whose sum is σ = 66534552. Its totient is φ = 66081352.

The previous prime is 66307933. The next prime is 66307963. The reversal of 66307951 is 15970366.

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 66307951 - 2¹⁷ = 66176879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66307951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66307931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112861 + ... + 113446.

It is an arithmetic number, because the mean of its divisors is an integer number (16633638).

Almost surely, 2^66307951 is an apocalyptic number.

66307951 is a deficient number, since it is larger than the sum of its proper divisors (226601).

66307951 is a wasteful number, since it uses less digits than its factorization.

66307951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226600.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 66307951 is about 8142.9694215317. The cubic root of 66307951 is about 404.7515643453.

The spelling of 66307951 in words is "sixty-six million, three hundred seven thousand, nine hundred fifty-one".