66073831 has 4 divisors (see below), whose sum is σ = 66107664. Its totient is φ = 66040000.

The previous prime is 66073829. The next prime is 66073853. The reversal of 66073831 is 13837066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13837066 = 2 ⋅6918533.

It is a cyclic number.

It is not a de Polignac number, because 66073831 - 2¹ = 66073829 is a prime.

It is a super-2 number, since 2×66073831² = 8731502286033122, 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 (66073331) 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, 13795 + ... + 17956.

It is an arithmetic number, because the mean of its divisors is an integer number (16526916).

Almost surely, 2^66073831 is an apocalyptic number.

66073831 is a deficient number, since it is larger than the sum of its proper divisors (33833).

66073831 is a wasteful number, since it uses less digits than its factorization.

66073831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33832.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 66073831 is about 8128.5811184979. The cubic root of 66073831 is about 404.2746372158.

The spelling of 66073831 in words is "sixty-six million, seventy-three thousand, eight hundred thirty-one".