12156071565 has 32 divisors (see below), whose sum is σ = 21249133056. Its totient is φ = 5885168960.

The previous prime is 12156071537. The next prime is 12156071621. The reversal of 12156071565 is 56517065121.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12156071565 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 (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58762 + ... + 166628.

It is an arithmetic number, because the mean of its divisors is an integer number (664035408).

Almost surely, 2^12156071565 is an apocalyptic number.

12156071565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12156071565 is a deficient number, since it is larger than the sum of its proper divisors (9093061491).

12156071565 is a wasteful number, since it uses less digits than its factorization.

12156071565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108569.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 12156071565 in words is "twelve billion, one hundred fifty-six million, seventy-one thousand, five hundred sixty-five".