667810101685 has 8 divisors (see below), whose sum is σ = 814509370296. Its totient is φ = 525489915840.

The previous prime is 667810101677. The next prime is 667810101781. The reversal of 667810101685 is 586101018766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48946252644 + 618863849041 = 221238^2 + 786679^2 .

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

It is not a de Polignac number, because 667810101685 - 2³ = 667810101677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094770354 + ... + 1094770963.

It is an arithmetic number, because the mean of its divisors is an integer number (101813671287).

Almost surely, 2^667810101685 is an apocalyptic number.

It is an amenable number.

667810101685 is a deficient number, since it is larger than the sum of its proper divisors (146699268611).

667810101685 is a wasteful number, since it uses less digits than its factorization.

667810101685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189541383.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 667810101685 in words is "six hundred sixty-seven billion, eight hundred ten million, one hundred one thousand, six hundred eighty-five".