66515228236 has 24 divisors (see below), whose sum is σ = 117857066544. Its totient is φ = 32842141440.

The previous prime is 66515228233. The next prime is 66515228237. The reversal of 66515228236 is 63282251566.

It is not an unprimeable number, because it can be changed into a prime (66515228231) 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, 713376 + ... + 801208.

It is an arithmetic number, because the mean of its divisors is an integer number (4910711106).

Almost surely, 2^66515228236 is an apocalyptic number.

It is an amenable number.

66515228236 is a deficient number, since it is larger than the sum of its proper divisors (51341838308).

66515228236 is a wasteful number, since it uses less digits than its factorization.

66515228236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90201 (or 90199 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The spelling of 66515228236 in words is "sixty-six billion, five hundred fifteen million, two hundred twenty-eight thousand, two hundred thirty-six".