667231585812 has 192 divisors, whose sum is σ = 1928329804800. Its totient is φ = 197798290560.

The previous prime is 667231585807. The next prime is 667231585819. The reversal of 667231585812 is 218585132766.

667231585812 is a `hidden beast` number, since 6 + 6 + 7 + 2 + 3 + 1 + 58 + 581 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667231585819) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21833239 + ... + 21863777.

It is an arithmetic number, because the mean of its divisors is an integer number (10043384400).

Almost surely, 2^667231585812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667231585812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964164902400).

667231585812 is an abundant number, since it is smaller than the sum of its proper divisors (1261098218988).

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

667231585812 is a wasteful number, since it uses less digits than its factorization.

667231585812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30963 (or 30955 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 667231585812 in words is "six hundred sixty-seven billion, two hundred thirty-one million, five hundred eighty-five thousand, eight hundred twelve".