12072561887 has 4 divisors (see below), whose sum is σ = 12277181640. Its totient is φ = 11867942136.

The previous prime is 12072561877. The next prime is 12072561901. The reversal of 12072561887 is 78816527021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78816527021 = 751 ⋅104948771.

It is a cyclic number.

It is not a de Polignac number, because 12072561887 - 2¹⁶ = 12072496351 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 (12072561827) 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, 102309788 + ... + 102309905.

It is an arithmetic number, because the mean of its divisors is an integer number (3069295410).

Almost surely, 2^12072561887 is an apocalyptic number.

12072561887 is a deficient number, since it is larger than the sum of its proper divisors (204619753).

12072561887 is an equidigital number, since it uses as much as digits as its factorization.

12072561887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204619752.

The product of its (nonzero) digits is 376320, while the sum is 47.

The spelling of 12072561887 in words is "twelve billion, seventy-two million, five hundred sixty-one thousand, eight hundred eighty-seven".