121660623153 has 12 divisors (see below), whose sum is σ = 183372533760. Its totient is φ = 77580687096.

The previous prime is 121660623137. The next prime is 121660623163. The reversal of 121660623153 is 351326066121.

121660623153 is a `hidden beast` number, since 1 + 2 + 16 + 6 + 0 + 623 + 15 + 3 = 666.

It is not a de Polignac number, because 121660623153 - 2⁴ = 121660623137 is a prime.

It is a super-2 number, since 2×121660623153² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121660623103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293866033 + ... + 293866446.

It is an arithmetic number, because the mean of its divisors is an integer number (15281044480).

Almost surely, 2^121660623153 is an apocalyptic number.

It is an amenable number.

121660623153 is a deficient number, since it is larger than the sum of its proper divisors (61711910607).

121660623153 is a wasteful number, since it uses less digits than its factorization.

121660623153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587732508 (or 587732505 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Adding to 121660623153 its reverse (351326066121), we get a palindrome (472986689274).

The spelling of 121660623153 in words is "one hundred twenty-one billion, six hundred sixty million, six hundred twenty-three thousand, one hundred fifty-three".