667705366624 has 96 divisors (see below), whose sum is σ = 1409524695936. Its totient is φ = 310246195200.

The previous prime is 667705366483. The next prime is 667705366673. The reversal of 667705366624 is 426663507766.

667705366624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 20147892 + ... + 20181004.

It is an arithmetic number, because the mean of its divisors is an integer number (14682548916).

Almost surely, 2^667705366624 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 667705366624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704762347968).

667705366624 is an abundant number, since it is smaller than the sum of its proper divisors (741819329312).

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

667705366624 is a wasteful number, since it uses less digits than its factorization.

667705366624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33608 (or 33600 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 58.

The spelling of 667705366624 in words is "six hundred sixty-seven billion, seven hundred five million, three hundred sixty-six thousand, six hundred twenty-four".