666627281754408 has 192 divisors, whose sum is σ = 1986037852780800. Its totient is φ = 200717584842240.

The previous prime is 666627281754383. The next prime is 666627281754479. The reversal of 666627281754408 is 804457182726666.

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 47 ways as a sum of consecutive naturals, for example, 256544383 + ... + 259129841.

It is an arithmetic number, because the mean of its divisors is an integer number (10343947149900).

Almost surely, 2^{666627281754408} 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 666627281754408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993018926390400).

666627281754408 is an abundant number, since it is smaller than the sum of its proper divisors (1319410571026392).

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

666627281754408 is a wasteful number, since it uses less digits than its factorization.

666627281754408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591392 (or 2591385 counting only the distinct ones).

The product of its (nonzero) digits is 1300561920, while the sum is 72.

The spelling of 666627281754408 in words is "six hundred sixty-six trillion, six hundred twenty-seven billion, two hundred eighty-one million, seven hundred fifty-four thousand, four hundred eight".