666348540035640 has 512 divisors, whose sum is σ = 2522818864742400. Its totient is φ = 136768092733440.

The previous prime is 666348540035627. The next prime is 666348540035663. The reversal of 666348540035640 is 46530045843666.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4220281816 + ... + 4220439704.

It is an arithmetic number, because the mean of its divisors is an integer number (4927380595200).

Almost surely, 2^{666348540035640} is an apocalyptic number.

666348540035640 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 666348540035640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261409432371200).

666348540035640 is an abundant number, since it is smaller than the sum of its proper divisors (1856470324706760).

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

666348540035640 is a wasteful number, since it uses less digits than its factorization.

666348540035640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163507 (or 163503 counting only the distinct ones).

The product of its (nonzero) digits is 149299200, while the sum is 60.

The spelling of 666348540035640 in words is "six hundred sixty-six trillion, three hundred forty-eight billion, five hundred forty million, thirty-five thousand, six hundred forty".