66674831 has 4 divisors (see below), whose sum is σ = 68825664. Its totient is φ = 64524000.

The previous prime is 66674827. The next prime is 66674843. The reversal of 66674831 is 13847666.

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 66674831 - 2² = 66674827 is a prime.

It is a super-2 number, since 2×66674831² = 8891066177757122, 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 (66674801) 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, 1075370 + ... + 1075431.

It is an arithmetic number, because the mean of its divisors is an integer number (17206416).

Almost surely, 2^66674831 is an apocalyptic number.

66674831 is a deficient number, since it is larger than the sum of its proper divisors (2150833).

66674831 is a wasteful number, since it uses less digits than its factorization.

66674831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150832.

The product of its digits is 145152, while the sum is 41.

The square root of 66674831 is about 8165.4657552402. The cubic root of 66674831 is about 405.4966847374.

The spelling of 66674831 in words is "sixty-six million, six hundred seventy-four thousand, eight hundred thirty-one".