667181281386 has 32 divisors (see below), whose sum is σ = 1339995202560. Its totient is φ = 221456931696.

The previous prime is 667181281367. The next prime is 667181281409. The reversal of 667181281386 is 683182181766.

It is a happy number.

667181281386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132575 + ... + 1617741.

It is an arithmetic number, because the mean of its divisors is an integer number (41874850080).

Almost surely, 2^667181281386 is an apocalyptic number.

667181281386 is an abundant number, since it is smaller than the sum of its proper divisors (672813921174).

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

667181281386 is a wasteful number, since it uses less digits than its factorization.

667181281386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486138.

The product of its digits is 4644864, while the sum is 57.

The spelling of 667181281386 in words is "six hundred sixty-seven billion, one hundred eighty-one million, two hundred eighty-one thousand, three hundred eighty-six".