66748319 has 20 divisors (see below), whose sum is σ = 75757920. Its totient is φ = 58776960.

The previous prime is 66748291. The next prime is 66748321. The reversal of 66748319 is 91384766.

It is a de Polignac number, because none of the positive numbers 2^k-66748319 is a prime.

It is a super-2 number, since 2×66748319² = 8910676178651522, which contains 22 as substring.

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 66748319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66748379) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 688079 + ... + 688175.

It is an arithmetic number, because the mean of its divisors is an integer number (3787896).

Almost surely, 2^66748319 is an apocalyptic number.

66748319 is a deficient number, since it is larger than the sum of its proper divisors (9009601).

66748319 is an frugal number, since it uses more digits than its factorization.

66748319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 155 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 66748319 is about 8169.9644430071. The cubic root of 66748319 is about 405.6456074946.

The spelling of 66748319 in words is "sixty-six million, seven hundred forty-eight thousand, three hundred nineteen".