667738554670 has 64 divisors (see below), whose sum is σ = 1393129886400. Its totient is φ = 228530657280.

The previous prime is 667738554643. The next prime is 667738554793. The reversal of 667738554670 is 76455837766.

It is a super-3 number, since 3×667738554670³ (a number of 36 digits) contains 333 as substring.

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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77355 + ... + 1158214.

It is an arithmetic number, because the mean of its divisors is an integer number (21767654475).

Almost surely, 2^667738554670 is an apocalyptic number.

667738554670 is an abundant number, since it is smaller than the sum of its proper divisors (725391331730).

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

667738554670 is a wasteful number, since it uses less digits than its factorization.

667738554670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235638 (or 1235604 counting only the distinct ones).

The product of its (nonzero) digits is 177811200, while the sum is 64.

The spelling of 667738554670 in words is "six hundred sixty-seven billion, seven hundred thirty-eight million, five hundred fifty-four thousand, six hundred seventy".