66842931 has 8 divisors (see below), whose sum is σ = 93814720. Its totient is φ = 42216552.

The previous prime is 66842863. The next prime is 66842959. The reversal of 66842931 is 13924866.

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

It is not a de Polignac number, because 66842931 - 2¹¹ = 66840883 is a prime.

It is a super-2 number, since 2×66842931² = 8935954849341522, 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 66842931.

It is not an unprimeable number, because it can be changed into a prime (66842981) 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, 586285 + ... + 586398.

It is an arithmetic number, because the mean of its divisors is an integer number (11726840).

Almost surely, 2^66842931 is an apocalyptic number.

66842931 is a deficient number, since it is larger than the sum of its proper divisors (26971789).

66842931 is a wasteful number, since it uses less digits than its factorization.

66842931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172705.

The product of its digits is 62208, while the sum is 39.

The square root of 66842931 is about 8175.7526259055. The cubic root of 66842931 is about 405.8371769790.

The spelling of 66842931 in words is "sixty-six million, eight hundred forty-two thousand, nine hundred thirty-one".