66349994 has 16 divisors (see below), whose sum is σ = 102187008. Its totient is φ = 32295312.

The previous prime is 66349979. The next prime is 66350003. The reversal of 66349994 is 49994366.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16727 + ... + 20309.

It is an arithmetic number, because the mean of its divisors is an integer number (6386688).

Almost surely, 2^66349994 is an apocalyptic number.

66349994 is a deficient number, since it is larger than the sum of its proper divisors (35837014).

66349994 is a wasteful number, since it uses less digits than its factorization.

66349994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829.

The product of its digits is 1259712, while the sum is 50.

The square root of 66349994 is about 8145.5505645720. The cubic root of 66349994 is about 404.8370914173.

The spelling of 66349994 in words is "sixty-six million, three hundred forty-nine thousand, nine hundred ninety-four".