666387356404 has 192 divisors, whose sum is σ = 1531277475840. Its totient is φ = 248302454400.

The previous prime is 666387356399. The next prime is 666387356407. The reversal of 666387356404 is 404653783666.

666387356404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666387356404² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666387356407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81351949 + ... + 81360139.

It is an arithmetic number, because the mean of its divisors is an integer number (7975403520).

Almost surely, 2^666387356404 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 666387356404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765638737920).

666387356404 is an abundant number, since it is smaller than the sum of its proper divisors (864890119436).

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

666387356404 is a wasteful number, since it uses less digits than its factorization.

666387356404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331 (or 8307 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 58.

The spelling of 666387356404 in words is "six hundred sixty-six billion, three hundred eighty-seven million, three hundred fifty-six thousand, four hundred four".