66543427964 has 72 divisors (see below), whose sum is σ = 135210094320. Its totient is φ = 28473882624.

The previous prime is 66543427963. The next prime is 66543428011. The reversal of 66543427964 is 46972434566.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66543427963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 973832 + ... + 1039920.

Almost surely, 2^66543427964 is an apocalyptic number.

It is an amenable number.

66543427964 is an abundant number, since it is smaller than the sum of its proper divisors (68666666356).

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

66543427964 is a wasteful number, since it uses less digits than its factorization.

66543427964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66207 (or 66188 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 56.

The spelling of 66543427964 in words is "sixty-six billion, five hundred forty-three million, four hundred twenty-seven thousand, nine hundred sixty-four".