666136670472 has 480 divisors, whose sum is σ = 2381554791000. Its totient is φ = 172363935744.

The previous prime is 666136670461. The next prime is 666136670491. The reversal of 666136670472 is 274076631666.

It can be written as a sum of positive squares in 4 ways, for example, as 395472445956 + 270664224516 = 628866^2 + 520254^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 21861904 + ... + 21892352.

Almost surely, 2^666136670472 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 666136670472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190777395500).

666136670472 is an abundant number, since it is smaller than the sum of its proper divisors (1715418120528).

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

666136670472 is a wasteful number, since it uses less digits than its factorization.

666136670472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30547 (or 30527 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 666136670472 in words is "six hundred sixty-six billion, one hundred thirty-six million, six hundred seventy thousand, four hundred seventy-two".