66651500052 has 48 divisors (see below), whose sum is σ = 178758820800. Its totient is φ = 21451056480.

The previous prime is 66651500029. The next prime is 66651500057. The reversal of 66651500052 is 25000515666.

It is a happy number.

66651500052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66651500057) 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, 10637274 + ... + 10643537.

It is an arithmetic number, because the mean of its divisors is an integer number (3724142100).

Almost surely, 2^66651500052 is an apocalyptic number.

It is an amenable number.

66651500052 is an abundant number, since it is smaller than the sum of its proper divisors (112107320748).

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

66651500052 is a wasteful number, since it uses less digits than its factorization.

66651500052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21280853 (or 21280845 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 66651500052 in words is "sixty-six billion, six hundred fifty-one million, five hundred thousand, fifty-two".