666928253376 has 672 divisors, whose sum is σ = 2534769469440. Its totient is φ = 162312192000.

The previous prime is 666928253371. The next prime is 666928253377. The reversal of 666928253376 is 673352829666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666928253371) 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, 180200326 + ... + 180204026.

Almost surely, 2^666928253376 is an apocalyptic number.

666928253376 is a gapful number since it is divisible by the number (66) 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 666928253376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1267384734720).

666928253376 is an abundant number, since it is smaller than the sum of its proper divisors (1867841216064).

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

666928253376 is a wasteful number, since it uses less digits than its factorization.

666928253376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993 (or 3980 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 63.

The spelling of 666928253376 in words is "six hundred sixty-six billion, nine hundred twenty-eight million, two hundred fifty-three thousand, three hundred seventy-six".