666950493888 has 896 divisors, whose sum is σ = 2366145331200. Its totient is φ = 180278784000.

The previous prime is 666950493871. The next prime is 666950493893. The reversal of 666950493888 is 888394059666.

It is a super-2 number, since 2×666950493888² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4416890613 + ... + 4416890763.

It is an arithmetic number, because the mean of its divisors is an integer number (2640787200).

Almost surely, 2^666950493888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666950493888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183072665600).

666950493888 is an abundant number, since it is smaller than the sum of its proper divisors (1699194837312).

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

666950493888 is a wasteful number, since it uses less digits than its factorization.

666950493888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 72.

The spelling of 666950493888 in words is "six hundred sixty-six billion, nine hundred fifty million, four hundred ninety-three thousand, eight hundred eighty-eight".