666225155736 has 256 divisors, whose sum is σ = 2200436736000. Its totient is φ = 182757617280.

The previous prime is 666225155719. The next prime is 666225155789. The reversal of 666225155736 is 637551522666.

666225155736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5896785 + ... + 6008703.

It is an arithmetic number, because the mean of its divisors is an integer number (8595456000).

Almost surely, 2^666225155736 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 666225155736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100218368000).

666225155736 is an abundant number, since it is smaller than the sum of its proper divisors (1534211580264).

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

666225155736 is a wasteful number, since it uses less digits than its factorization.

666225155736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112099 (or 112089 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 54.

The spelling of 666225155736 in words is "six hundred sixty-six billion, two hundred twenty-five million, one hundred fifty-five thousand, seven hundred thirty-six".