667687949786766 has 32 divisors (see below), whose sum is σ = 1337397073867008. Its totient is φ = 222225999353280.

The previous prime is 667687949786743. The next prime is 667687949786791.

667687949786766 is nontrivially palindromic in base 10.

667687949786766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

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, 13864090 + ... + 39084381.

It is an arithmetic number, because the mean of its divisors is an integer number (41793658558344).

Almost surely, 2^{667687949786766} is an apocalyptic number.

667687949786766 is an abundant number, since it is smaller than the sum of its proper divisors (669709124080242).

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

667687949786766 is a wasteful number, since it uses less digits than its factorization.

667687949786766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52951656.

The product of its digits is 2322868617216, while the sum is 102.

The spelling of 667687949786766 in words is "six hundred sixty-seven trillion, six hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, seven hundred sixty-six".