667231536678 has 64 divisors (see below), whose sum is σ = 1572106641408. Its totient is φ = 184837652640.

The previous prime is 667231536677. The next prime is 667231536703. The reversal of 667231536678 is 876635132766.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667231536677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1368268 + ... + 1790703.

It is an arithmetic number, because the mean of its divisors is an integer number (24564166272).

Almost surely, 2^667231536678 is an apocalyptic number.

667231536678 is an abundant number, since it is smaller than the sum of its proper divisors (904875104730).

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

667231536678 is a wasteful number, since it uses less digits than its factorization.

667231536678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159137.

The product of its digits is 45722880, while the sum is 60.

The spelling of 667231536678 in words is "six hundred sixty-seven billion, two hundred thirty-one million, five hundred thirty-six thousand, six hundred seventy-eight".