12154577545121 has 16 divisors (see below), whose sum is σ = 14039630674560. Its totient is φ = 10399550657280.

The previous prime is 12154577545109. The next prime is 12154577545129.

12154577545121 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12154577545121 - 2²² = 12154573350817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12154577545121.

It is not an unprimeable number, because it can be changed into a prime (12154577545129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32072675 + ... + 32449431.

It is an arithmetic number, because the mean of its divisors is an integer number (877476917160).

Almost surely, 2^{12154577545121} is an apocalyptic number.

12154577545121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12154577545121 is a deficient number, since it is larger than the sum of its proper divisors (1885053129439).

12154577545121 is a wasteful number, since it uses less digits than its factorization.

12154577545121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549304.

The product of its digits is 1960000, while the sum is 50.

The spelling of 12154577545121 in words is "twelve trillion, one hundred fifty-four billion, five hundred seventy-seven million, five hundred forty-five thousand, one hundred twenty-one".