66851996 has 12 divisors (see below), whose sum is σ = 120765120. Its totient is φ = 32347680.

The previous prime is 66851987. The next prime is 66852029. The reversal of 66851996 is 69915866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269441 + ... + 269688.

It is an arithmetic number, because the mean of its divisors is an integer number (10063760).

Almost surely, 2^66851996 is an apocalyptic number.

It is an amenable number.

66851996 is a deficient number, since it is larger than the sum of its proper divisors (53913124).

66851996 is a wasteful number, since it uses less digits than its factorization.

66851996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539164 (or 539162 counting only the distinct ones).

The product of its digits is 699840, while the sum is 50.

The square root of 66851996 is about 8176.3069903227. The cubic root of 66851996 is about 405.8555222134.

The spelling of 66851996 in words is "sixty-six million, eight hundred fifty-one thousand, nine hundred ninety-six".