121616666171 has 48 divisors (see below), whose sum is σ = 166317002208. Its totient is φ = 87417792000.

The previous prime is 121616666167. The next prime is 121616666177. The reversal of 121616666171 is 171666616121.

It is not a de Polignac number, because 121616666171 - 2² = 121616666167 is a prime.

It is a super-2 number, since 2×121616666171² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121616666177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12278321 + ... + 12288221.

It is an arithmetic number, because the mean of its divisors is an integer number (3464937546).

Almost surely, 2^121616666171 is an apocalyptic number.

121616666171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121616666171 is a deficient number, since it is larger than the sum of its proper divisors (44700336037).

121616666171 is a wasteful number, since it uses less digits than its factorization.

121616666171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11692 (or 11685 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

It can be divided in two parts, 121616 and 666171, that added together give a palindrome (787787).

The spelling of 121616666171 in words is "one hundred twenty-one billion, six hundred sixteen million, six hundred sixty-six thousand, one hundred seventy-one".