66669951 has 8 divisors (see below), whose sum is σ = 90111280. Its totient is φ = 43837632.

The previous prime is 66669947. The next prime is 66669983. The reversal of 66669951 is 15996666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66669951 - 2² = 66669947 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 66669951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66669931) 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 7 ways as a sum of consecutive naturals, for example, 151996 + ... + 152433.

It is an arithmetic number, because the mean of its divisors is an integer number (11263910).

Almost surely, 2^66669951 is an apocalyptic number.

66669951 is a deficient number, since it is larger than the sum of its proper divisors (23441329).

66669951 is a wasteful number, since it uses less digits than its factorization.

66669951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304505.

The product of its digits is 524880, while the sum is 48.

The square root of 66669951 is about 8165.1669303205. The cubic root of 66669951 is about 405.4867915885.

It can be divided in two parts, 6666 and 9951, that multiplied together give a palindrome (66333366).

The spelling of 66669951 in words is "sixty-six million, six hundred sixty-nine thousand, nine hundred fifty-one".