667421042837 has 8 divisors (see below), whose sum is σ = 674257417272. Its totient is φ = 660589144000.

The previous prime is 667421042791. The next prime is 667421042839. The reversal of 667421042837 is 738240124766.

667421042837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 361843153156 + 305577889681 = 601534^2 + 552791^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 667421042837 - 2²² = 667416848533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667421042839) 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, 818714 + ... + 1416027.

It is an arithmetic number, because the mean of its divisors is an integer number (84282177159).

Almost surely, 2^667421042837 is an apocalyptic number.

It is an amenable number.

667421042837 is a deficient number, since it is larger than the sum of its proper divisors (6836374435).

667421042837 is a wasteful number, since it uses less digits than its factorization.

667421042837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237799.

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 667421042837 in words is "six hundred sixty-seven billion, four hundred twenty-one million, forty-two thousand, eight hundred thirty-seven".