668536837 has 8 divisors (see below), whose sum is σ = 697898880. Its totient is φ = 639199440.

The previous prime is 668536801. The next prime is 668536853. The reversal of 668536837 is 738635866.

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

It is not a de Polignac number, because 668536837 - 2¹⁵ = 668504069 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 (668533837) 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, 68839 + ... + 77947.

It is an arithmetic number, because the mean of its divisors is an integer number (87237360).

Almost surely, 2^668536837 is an apocalyptic number.

It is an amenable number.

668536837 is a deficient number, since it is larger than the sum of its proper divisors (29362043).

668536837 is a wasteful number, since it uses less digits than its factorization.

668536837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12323.

The product of its digits is 4354560, while the sum is 52.

The square root of 668536837 is about 25856.0793044885. The cubic root of 668536837 is about 874.3965742140.

The spelling of 668536837 in words is "six hundred sixty-eight million, five hundred thirty-six thousand, eight hundred thirty-seven".