667541388768 has 24 divisors (see below), whose sum is σ = 1752296145768. Its totient is φ = 222513796224.

The previous prime is 667541388727. The next prime is 667541388869. The reversal of 667541388768 is 867883145766.

667541388768 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×667541388768² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476777971 + ... + 3476778162.

It is an arithmetic number, because the mean of its divisors is an integer number (73012339407).

Almost surely, 2^667541388768 is an apocalyptic number.

It is an amenable number.

667541388768 is an abundant number, since it is smaller than the sum of its proper divisors (1084754757000).

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

667541388768 is a wasteful number, since it uses less digits than its factorization.

667541388768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6953556146 (or 6953556138 counting only the distinct ones).

The product of its digits is 325140480, while the sum is 69.

The spelling of 667541388768 in words is "six hundred sixty-seven billion, five hundred forty-one million, three hundred eighty-eight thousand, seven hundred sixty-eight".