66203895516 has 48 divisors (see below), whose sum is σ = 171375281280. Its totient is φ = 19721753920.

The previous prime is 66203895479. The next prime is 66203895529. The reversal of 66203895516 is 61559830266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4242591 + ... + 4258166.

It is an arithmetic number, because the mean of its divisors is an integer number (3570318360).

Almost surely, 2^66203895516 is an apocalyptic number.

66203895516 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66203895516 is an abundant number, since it is smaller than the sum of its proper divisors (105171385764).

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

66203895516 is a wasteful number, since it uses less digits than its factorization.

66203895516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500834 (or 8500832 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 66203895516 in words is "sixty-six billion, two hundred three million, eight hundred ninety-five thousand, five hundred sixteen".