66674291 has 4 divisors (see below), whose sum is σ = 66730032. Its totient is φ = 66618552.

The previous prime is 66674243. The next prime is 66674297. The reversal of 66674291 is 19247666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19247666 = 2 ⋅9623833.

It is a cyclic number.

It is not a de Polignac number, because 66674291 - 2⁶ = 66674227 is a prime.

It is a super-2 number, since 2×66674291² = 8890922160705362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66674297) 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, 26036 + ... + 28481.

It is an arithmetic number, because the mean of its divisors is an integer number (16682508).

Almost surely, 2^66674291 is an apocalyptic number.

66674291 is a deficient number, since it is larger than the sum of its proper divisors (55741).

66674291 is a wasteful number, since it uses less digits than its factorization.

66674291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55740.

The product of its digits is 108864, while the sum is 41.

The square root of 66674291 is about 8165.4326890864. The cubic root of 66674291 is about 405.4955900275.

The spelling of 66674291 in words is "sixty-six million, six hundred seventy-four thousand, two hundred ninety-one".