66203916 has 24 divisors (see below), whose sum is σ = 163563120. Its totient is φ = 20769792.

The previous prime is 66203911. The next prime is 66203927. The reversal of 66203916 is 61930266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66203911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162061 + ... + 162468.

It is an arithmetic number, because the mean of its divisors is an integer number (6815130).

Almost surely, 2^66203916 is an apocalyptic number.

It is an amenable number.

66203916 is an abundant number, since it is smaller than the sum of its proper divisors (97359204).

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

66203916 is a wasteful number, since it uses less digits than its factorization.

66203916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324553 (or 324551 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 66203916 is about 8136.5788879602. The cubic root of 66203916 is about 404.5397728996.

The spelling of 66203916 in words is "sixty-six million, two hundred three thousand, nine hundred sixteen".