666898936835040 has 1152 divisors, whose sum is σ = 2912949480010752. Its totient is φ = 140309477130240.

The previous prime is 666898936835029. The next prime is 666898936835101. The reversal of 666898936835040 is 40538639898666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1248675255 + ... + 1249209225.

It is an arithmetic number, because the mean of its divisors is an integer number (2528601979176).

Almost surely, 2^{666898936835040} is an apocalyptic number.

666898936835040 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 666898936835040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1456474740005376).

666898936835040 is an abundant number, since it is smaller than the sum of its proper divisors (2246050543175712).

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

666898936835040 is a wasteful number, since it uses less digits than its factorization.

666898936835040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534374 (or 534354 counting only the distinct ones).

The product of its (nonzero) digits is 9674588160, while the sum is 81.

The spelling of 666898936835040 in words is "six hundred sixty-six trillion, eight hundred ninety-eight billion, nine hundred thirty-six million, eight hundred thirty-five thousand, forty".