660949642806 has 36 divisors (see below), whose sum is σ = 1344172064508. Its totient is φ = 216664972800.

The previous prime is 660949642777. The next prime is 660949642817. The reversal of 660949642806 is 608246949066.

It is a super-3 number, since 3×660949642806³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660949642806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 121473046 + ... + 121478486.

It is an arithmetic number, because the mean of its divisors is an integer number (37338112903).

Almost surely, 2^660949642806 is an apocalyptic number.

660949642806 is an abundant number, since it is smaller than the sum of its proper divisors (683222421702).

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

660949642806 is an frugal number, since it uses more digits than its factorization.

660949642806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11009 (or 5507 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 60.

The spelling of 660949642806 in words is "six hundred sixty billion, nine hundred forty-nine million, six hundred forty-two thousand, eight hundred six".