66203994 has 16 divisors (see below), whose sum is σ = 133420320. Its totient is φ = 21899280.

The previous prime is 66203983. The next prime is 66204007. The reversal of 66203994 is 49930266.

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, 41329 + ... + 42900.

It is an arithmetic number, because the mean of its divisors is an integer number (8338770).

Almost surely, 2^66203994 is an apocalyptic number.

66203994 is an abundant number, since it is smaller than the sum of its proper divisors (67216326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66203994 is a wasteful number, since it uses less digits than its factorization.

66203994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84365.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 66203994 is about 8136.5836811281. The cubic root of 66203994 is about 404.5399317728.

The spelling of 66203994 in words is "sixty-six million, two hundred three thousand, nine hundred ninety-four".