121816668154 has 8 divisors (see below), whose sum is σ = 193473531828. Its totient is φ = 57325490880.

The previous prime is 121816668151. The next prime is 121816668161. The reversal of 121816668154 is 451866618121.

It can be written as a sum of positive squares in 2 ways, for example, as 121797510025 + 19158129 = 348995^2 + 4377^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121816668098 and 121816668107.

It is not an unprimeable number, because it can be changed into a prime (121816668151) 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, 1791421557 + ... + 1791421624.

Almost surely, 2^121816668154 is an apocalyptic number.

121816668154 is a deficient number, since it is larger than the sum of its proper divisors (71656863674).

121816668154 is a wasteful number, since it uses less digits than its factorization.

121816668154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582843200.

The product of its digits is 552960, while the sum is 49.

The spelling of 121816668154 in words is "one hundred twenty-one billion, eight hundred sixteen million, six hundred sixty-eight thousand, one hundred fifty-four".