66349919 has 8 divisors (see below), whose sum is σ = 70800240. Its totient is φ = 61995456.

The previous prime is 66349909. The next prime is 66349937. The reversal of 66349919 is 91994366.

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

It is a cyclic number.

It is not a de Polignac number, because 66349919 - 2⁸ = 66349663 is a prime.

It is a super-2 number, since 2×66349919² = 8804623502613122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66349909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22532 + ... + 25305.

It is an arithmetic number, because the mean of its divisors is an integer number (8850030).

Almost surely, 2^66349919 is an apocalyptic number.

66349919 is a deficient number, since it is larger than the sum of its proper divisors (4450321).

66349919 is a wasteful number, since it uses less digits than its factorization.

66349919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47929.

The product of its digits is 314928, while the sum is 47.

The square root of 66349919 is about 8145.5459608304. The cubic root of 66349919 is about 404.8369388788.

The spelling of 66349919 in words is "sixty-six million, three hundred forty-nine thousand, nine hundred nineteen".