666121637551733 has 8 divisors (see below), whose sum is σ = 726687599770080. Its totient is φ = 605557250285680.

The previous prime is 666121637551687. The next prime is 666121637551753. The reversal of 666121637551733 is 337155736121666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666121637551733 - 2¹⁴ = 666121637535349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666121637551753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392853638 + ... + 394545591.

It is an arithmetic number, because the mean of its divisors is an integer number (90835949971260).

Almost surely, 2^{666121637551733} is an apocalyptic number.

It is an amenable number.

666121637551733 is a deficient number, since it is larger than the sum of its proper divisors (60565962218347).

666121637551733 is a wasteful number, since it uses less digits than its factorization.

666121637551733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787476147.

The product of its digits is 85730400, while the sum is 62.

The spelling of 666121637551733 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, six hundred thirty-seven million, five hundred fifty-one thousand, seven hundred thirty-three".