121006166623 has 4 divisors (see below), whose sum is σ = 121041072360. Its totient is φ = 120971260888.

The previous prime is 121006166573. The next prime is 121006166627. The reversal of 121006166623 is 326661600121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326661600121 = 883 ⋅369945187.

It is a cyclic number.

It is not a de Polignac number, because 121006166623 - 2³³ = 112416232031 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 (121006166627) 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 3 ways as a sum of consecutive naturals, for example, 17447668 + ... + 17454601.

It is an arithmetic number, because the mean of its divisors is an integer number (30260268090).

Almost surely, 2^121006166623 is an apocalyptic number.

121006166623 is a deficient number, since it is larger than the sum of its proper divisors (34905737).

121006166623 is an equidigital number, since it uses as much as digits as its factorization.

121006166623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34905736.

The product of its (nonzero) digits is 15552, while the sum is 34.

Adding to 121006166623 its reverse (326661600121), we get a palindrome (447667766744).

The spelling of 121006166623 in words is "one hundred twenty-one billion, six million, one hundred sixty-six thousand, six hundred twenty-three".