666145261767240 has 256 divisors, whose sum is σ = 2237473373184000. Its totient is φ = 176280762551040.

The previous prime is 666145261767199. The next prime is 666145261767269. The reversal of 666145261767240 is 42767162541666.

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, 330309535 + ... + 332320145.

It is an arithmetic number, because the mean of its divisors is an integer number (8740130364000).

Almost surely, 2^{666145261767240} is an apocalyptic number.

666145261767240 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 666145261767240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118736686592000).

666145261767240 is an abundant number, since it is smaller than the sum of its proper divisors (1571328111416760).

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

666145261767240 is a wasteful number, since it uses less digits than its factorization.

666145261767240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012977 (or 2012967 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 63.

The spelling of 666145261767240 in words is "six hundred sixty-six trillion, one hundred forty-five billion, two hundred sixty-one million, seven hundred sixty-seven thousand, two hundred forty".