66915068891500 has 48 divisors (see below), whose sum is σ = 147992415742080. Its totient is φ = 26427217065600.

The previous prime is 66915068891479. The next prime is 66915068891507. The reversal of 66915068891500 is 519886051966.

It is not an unprimeable number, because it can be changed into a prime (66915068891507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846986689 + ... + 847065688.

It is an arithmetic number, because the mean of its divisors is an integer number (3083175327960).

Almost surely, 2^{66915068891500} is an apocalyptic number.

It is an amenable number.

66915068891500 is an abundant number, since it is smaller than the sum of its proper divisors (81077346850580).

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

66915068891500 is a wasteful number, since it uses less digits than its factorization.

66915068891500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694052475 (or 1694052463 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 64.

The spelling of 66915068891500 in words is "sixty-six trillion, nine hundred fifteen billion, sixty-eight million, eight hundred ninety-one thousand, five hundred".