66511715500 has 48 divisors (see below), whose sum is σ = 146186992224. Its totient is φ = 26435198400.

The previous prime is 66511715423. The next prime is 66511715503. The reversal of 66511715500 is 551711566.

It is a self number, because there is not a number n which added to its sum of digits gives 66511715500.

It is not an unprimeable number, because it can be changed into a prime (66511715503) 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, 345142 + ... + 502141.

It is an arithmetic number, because the mean of its divisors is an integer number (3045562338).

Almost surely, 2^66511715500 is an apocalyptic number.

It is an amenable number.

66511715500 is an abundant number, since it is smaller than the sum of its proper divisors (79675276724).

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

66511715500 is a wasteful number, since it uses less digits than its factorization.

66511715500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847459 (or 847447 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 37.

The spelling of 66511715500 in words is "sixty-six billion, five hundred eleven million, seven hundred fifteen thousand, five hundred".