666780164460 has 288 divisors, whose sum is σ = 2087048291328. Its totient is φ = 172237578240.

The previous prime is 666780164441. The next prime is 666780164461. The reversal of 666780164460 is 64461087666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 666780164397 and 666780164406.

It is not an unprimeable number, because it can be changed into a prime (666780164461) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 315858805 + ... + 315860915.

It is an arithmetic number, because the mean of its divisors is an integer number (7246695456).

Almost surely, 2^666780164460 is an apocalyptic number.

666780164460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666780164460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043524145664).

666780164460 is an abundant number, since it is smaller than the sum of its proper divisors (1420268126868).

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

666780164460 is a wasteful number, since it uses less digits than its factorization.

666780164460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 666780164460 in words is "six hundred sixty-six billion, seven hundred eighty million, one hundred sixty-four thousand, four hundred sixty".