66534619 has 4 divisors (see below), whose sum is σ = 66557296. Its totient is φ = 66511944.

The previous prime is 66534593. The next prime is 66534647. The reversal of 66534619 is 91643566.

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-66534619 is a prime.

It is a super-2 number, since 2×66534619² = 8853711050950322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66534679) 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, 6144 + ... + 13069.

It is an arithmetic number, because the mean of its divisors is an integer number (16639324).

Almost surely, 2^66534619 is an apocalyptic number.

66534619 is a deficient number, since it is larger than the sum of its proper divisors (22677).

66534619 is a wasteful number, since it uses less digits than its factorization.

66534619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22676.

The product of its digits is 116640, while the sum is 40.

The square root of 66534619 is about 8156.8755660486. The cubic root of 66534619 is about 405.2122425615.

The spelling of 66534619 in words is "sixty-six million, five hundred thirty-four thousand, six hundred nineteen".