66193331 has 4 divisors (see below), whose sum is σ = 66676632. Its totient is φ = 65710032.

The previous prime is 66193319. The next prime is 66193349. The reversal of 66193331 is 13339166.

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 66193331 - 2²² = 61999027 is a prime.

It is a super-2 number, since 2×66193331² = 8763114137751122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66190331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241445 + ... + 241718.

It is an arithmetic number, because the mean of its divisors is an integer number (16669158).

Almost surely, 2^66193331 is an apocalyptic number.

66193331 is a deficient number, since it is larger than the sum of its proper divisors (483301).

66193331 is a wasteful number, since it uses less digits than its factorization.

66193331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483300.

The product of its digits is 8748, while the sum is 32.

The square root of 66193331 is about 8135.9284043064. The cubic root of 66193331 is about 404.5182118300.

The spelling of 66193331 in words is "sixty-six million, one hundred ninety-three thousand, three hundred thirty-one".