667688534340 has 48 divisors (see below), whose sum is σ = 1872983676480. Its totient is φ = 177721153920.

The previous prime is 667688534311. The next prime is 667688534341. The reversal of 667688534340 is 43435886766.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (667688534341) 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, 10252330 + ... + 10317249.

It is an arithmetic number, because the mean of its divisors is an integer number (39020493260).

Almost surely, 2^667688534340 is an apocalyptic number.

667688534340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667688534340 is an abundant number, since it is smaller than the sum of its proper divisors (1205295142140).

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

667688534340 is a wasteful number, since it uses less digits than its factorization.

667688534340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20570132 (or 20570130 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 60.

The spelling of 667688534340 in words is "six hundred sixty-seven billion, six hundred eighty-eight million, five hundred thirty-four thousand, three hundred forty".