666121156117614 has 128 divisors (see below), whose sum is σ = 1549101131136000. Its totient is φ = 211771859612544.

The previous prime is 666121156117559. The next prime is 666121156117733. The reversal of 666121156117614 is 416711651121666.

It is a happy number.

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 63 ways as a sum of consecutive naturals, for example, 1501854309 + ... + 1502297775.

It is an arithmetic number, because the mean of its divisors is an integer number (12102352587000).

Almost surely, 2^{666121156117614} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666121156117614, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774550565568000).

666121156117614 is an abundant number, since it is smaller than the sum of its proper divisors (882979975018386).

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

666121156117614 is a wasteful number, since it uses less digits than its factorization.

666121156117614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446999 (or 446993 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 666121156117614 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, one hundred fifty-six million, one hundred seventeen thousand, six hundred fourteen".