66865142680 has 64 divisors (see below), whose sum is σ = 174757654080. Its totient is φ = 22549363200.

The previous prime is 66865142653. The next prime is 66865142681. The reversal of 66865142680 is 8624156866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66865142681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1940331 + ... + 1974490.

It is an arithmetic number, because the mean of its divisors is an integer number (2730588345).

Almost surely, 2^66865142680 is an apocalyptic number.

It is an amenable number.

66865142680 is an abundant number, since it is smaller than the sum of its proper divisors (107892511400).

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

66865142680 is a wasteful number, since it uses less digits than its factorization.

66865142680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914900 (or 3914896 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 66865142680 in words is "sixty-six billion, eight hundred sixty-five million, one hundred forty-two thousand, six hundred eighty".