66491872603 has 8 divisors (see below), whose sum is σ = 72675388688. Its totient is φ = 60461036064.

The previous prime is 66491872519. The next prime is 66491872607. The reversal of 66491872603 is 30627819466.

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

It is not a de Polignac number, because 66491872603 - 2³³ = 57901938011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66491872607) 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, 38168976 + ... + 38170717.

It is an arithmetic number, because the mean of its divisors is an integer number (9084423586).

Almost surely, 2^66491872603 is an apocalyptic number.

66491872603 is a deficient number, since it is larger than the sum of its proper divisors (6183516085).

66491872603 is a wasteful number, since it uses less digits than its factorization.

66491872603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76339773.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 66491872603 in words is "sixty-six billion, four hundred ninety-one million, eight hundred seventy-two thousand, six hundred three".