66868686280 has 64 divisors (see below), whose sum is σ = 164756592000. Its totient is φ = 24223388160.

The previous prime is 66868686271. The next prime is 66868686289. The reversal of 66868686280 is 8268686866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66868686271) and next prime (66868686289).

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66868686289) 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, 173205 + ... + 404644.

It is an arithmetic number, because the mean of its divisors is an integer number (2574321750).

Almost surely, 2^66868686280 is an apocalyptic number.

It is an amenable number.

66868686280 is an abundant number, since it is smaller than the sum of its proper divisors (97887905720).

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

66868686280 is a wasteful number, since it uses less digits than its factorization.

66868686280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578134 (or 578130 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 64.

The spelling of 66868686280 in words is "sixty-six billion, eight hundred sixty-eight million, six hundred eighty-six thousand, two hundred eighty".