66203491 has 8 divisors (see below), whose sum is σ = 72515520. Its totient is φ = 60160128.

The previous prime is 66203477. The next prime is 66203537. The reversal of 66203491 is 19430266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66203491 - 2¹⁹ = 65679203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66203441) 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, 66651 + ... + 67636.

It is an arithmetic number, because the mean of its divisors is an integer number (9064440).

Almost surely, 2^66203491 is an apocalyptic number.

66203491 is a deficient number, since it is larger than the sum of its proper divisors (6312029).

66203491 is a wasteful number, since it uses less digits than its factorization.

66203491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134333.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66203491 is about 8136.5527712908. The cubic root of 66203491 is about 404.5389072420.

The spelling of 66203491 in words is "sixty-six million, two hundred three thousand, four hundred ninety-one".