666242741156220 has 168 divisors, whose sum is σ = 2165372931281280. Its totient is φ = 171933610504320.

The previous prime is 666242741156219. The next prime is 666242741156231. The reversal of 666242741156220 is 22651147242666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 736574815 + ... + 737478774.

It is an arithmetic number, because the mean of its divisors is an integer number (12889124590960).

Almost surely, 2^{666242741156220} is an apocalyptic number.

666242741156220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666242741156220 is an abundant number, since it is smaller than the sum of its proper divisors (1499130190125060).

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

666242741156220 is a wasteful number, since it uses less digits than its factorization.

666242741156220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474053647 (or 1474053630 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

Adding to 666242741156220 its reverse (22651147242666), we get a palindrome (688893888398886).

The spelling of 666242741156220 in words is "six hundred sixty-six trillion, two hundred forty-two billion, seven hundred forty-one million, one hundred fifty-six thousand, two hundred twenty".