667650334781 has 8 divisors (see below), whose sum is σ = 680339679744. Its totient is φ = 655056758880.

The previous prime is 667650334733. The next prime is 667650334789. The reversal of 667650334781 is 187433056766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667650334781 is a prime.

It is a super-2 number, since 2×667650334781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667650334789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23928191 + ... + 23956076.

It is an arithmetic number, because the mean of its divisors is an integer number (85042459968).

Almost surely, 2^667650334781 is an apocalyptic number.

It is an amenable number.

667650334781 is a deficient number, since it is larger than the sum of its proper divisors (12689344963).

667650334781 is a wasteful number, since it uses less digits than its factorization.

667650334781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47884531.

The product of its (nonzero) digits is 15240960, while the sum is 56.

The spelling of 667650334781 in words is "six hundred sixty-seven billion, six hundred fifty million, three hundred thirty-four thousand, seven hundred eighty-one".