12151278511855 has 32 divisors (see below), whose sum is σ = 16881213533184. Its totient is φ = 8224530794496.

The previous prime is 12151278511849. The next prime is 12151278511903. The reversal of 12151278511855 is 55811587215121.

It is a cyclic number.

It is not a de Polignac number, because 12151278511855 - 2¹¹ = 12151278509807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4382962 + ... + 6596431.

It is an arithmetic number, because the mean of its divisors is an integer number (527537922912).

Almost surely, 2^{12151278511855} is an apocalyptic number.

12151278511855 is a deficient number, since it is larger than the sum of its proper divisors (4729935021329).

12151278511855 is a wasteful number, since it uses less digits than its factorization.

12151278511855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10979815.

The product of its digits is 1120000, while the sum is 52.

The spelling of 12151278511855 in words is "twelve trillion, one hundred fifty-one billion, two hundred seventy-eight million, five hundred eleven thousand, eight hundred fifty-five".