666776378016 has 216 divisors, whose sum is σ = 2287414715040. Its totient is φ = 190507427712.

The previous prime is 666776377979. The next prime is 666776378089. The reversal of 666776378016 is 610873677666.

666776378016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (216).

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 493956 + ... + 1256003.

It is an arithmetic number, because the mean of its divisors is an integer number (10589882940).

Almost surely, 2^666776378016 is an apocalyptic number.

It is an amenable number.

666776378016 is an abundant number, since it is smaller than the sum of its proper divisors (1620638337024).

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

666776378016 is a wasteful number, since it uses less digits than its factorization.

666776378016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749998 (or 1749971 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 63.

The spelling of 666776378016 in words is "six hundred sixty-six billion, seven hundred seventy-six million, three hundred seventy-eight thousand, sixteen".