667521323700 has 144 divisors (see below), whose sum is σ = 2407931549184. Its totient is φ = 138705724800.

The previous prime is 667521323699. The next prime is 667521323701. The reversal of 667521323700 is 7323125766.

It is an interprime number because it is at equal distance from previous prime (667521323699) and next prime (667521323701).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667521323701) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14425414 + ... + 14471613.

Almost surely, 2^667521323700 is an apocalyptic number.

667521323700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667521323700 is an abundant number, since it is smaller than the sum of its proper divisors (1740410225484).

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

667521323700 is a wasteful number, since it uses less digits than its factorization.

667521323700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28897062 (or 28897055 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 42.

The spelling of 667521323700 in words is "six hundred sixty-seven billion, five hundred twenty-one million, three hundred twenty-three thousand, seven hundred".