66043511988 has 24 divisors (see below), whose sum is σ = 155541732192. Its totient is φ = 21808760544.

The previous prime is 66043511983. The next prime is 66043512011. The reversal of 66043511988 is 88911534066.

It is a self number, because there is not a number n which added to its sum of digits gives 66043511988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66043511983) 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, 25716595 + ... + 25719162.

It is an arithmetic number, because the mean of its divisors is an integer number (6480905508).

Almost surely, 2^66043511988 is an apocalyptic number.

It is an amenable number.

66043511988 is an abundant number, since it is smaller than the sum of its proper divisors (89498220204).

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

66043511988 is a wasteful number, since it uses less digits than its factorization.

66043511988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51435871 (or 51435869 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 66043511988 in words is "sixty-six billion, forty-three million, five hundred eleven thousand, nine hundred eighty-eight".