666121636366153 has 4 divisors (see below), whose sum is σ = 726678148763088. Its totient is φ = 605565123969220.

The previous prime is 666121636366141. The next prime is 666121636366201. The reversal of 666121636366153 is 351663636121666.

666121636366153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666121636366153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666121636366091 and 666121636366100.

It is not an unprimeable number, because it can be changed into a prime (666121636360153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30278256198451 + ... + 30278256198472.

It is an arithmetic number, because the mean of its divisors is an integer number (181669537190772).

Almost surely, 2^{666121636366153} is an apocalyptic number.

It is an amenable number.

666121636366153 is a deficient number, since it is larger than the sum of its proper divisors (60556512396935).

666121636366153 is a wasteful number, since it uses less digits than its factorization.

666121636366153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60556512396934.

The product of its digits is 75582720, while the sum is 61.

The spelling of 666121636366153 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, six hundred thirty-six million, three hundred sixty-six thousand, one hundred fifty-three".