666258098552640 has 896 divisors, whose sum is σ = 2609153290598400. Its totient is φ = 158681500139520.

The previous prime is 666258098552551. The next prime is 666258098552687. The reversal of 666258098552640 is 46255890852666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9291359667 + ... + 9291431373.

It is an arithmetic number, because the mean of its divisors is an integer number (2912001440400).

Almost surely, 2^{666258098552640} is an apocalyptic number.

666258098552640 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 666258098552640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1304576645299200).

666258098552640 is an abundant number, since it is smaller than the sum of its proper divisors (1942895192045760).

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

666258098552640 is a wasteful number, since it uses less digits than its factorization.

666258098552640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73460 (or 73444 counting only the distinct ones).

The product of its (nonzero) digits is 1492992000, while the sum is 72.

The spelling of 666258098552640 in words is "six hundred sixty-six trillion, two hundred fifty-eight billion, ninety-eight million, five hundred fifty-two thousand, six hundred forty".