66543274 has 24 divisors (see below), whose sum is σ = 118819008. Its totient is φ = 27853560.

The previous prime is 66543241. The next prime is 66543277. The reversal of 66543274 is 47234566.

It is not an unprimeable number, because it can be changed into a prime (66543277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3682 + ... + 12109.

It is an arithmetic number, because the mean of its divisors is an integer number (4950792).

Almost surely, 2^66543274 is an apocalyptic number.

66543274 is a deficient number, since it is larger than the sum of its proper divisors (52275734).

66543274 is a wasteful number, since it uses less digits than its factorization.

66543274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15850 (or 15843 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The square root of 66543274 is about 8157.4060828182. The cubic root of 66543274 is about 405.2298121614.

The spelling of 66543274 in words is "sixty-six million, five hundred forty-three thousand, two hundred seventy-four".