11971747887 has 8 divisors (see below), whose sum is σ = 17413451520. Its totient is φ = 7255604760.

The previous prime is 11971747873. The next prime is 11971747903. The reversal of 11971747887 is 78874717911.

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

It is not a de Polignac number, because 11971747887 - 2¹⁶ = 11971682351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11971747887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11971747817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181390087 + ... + 181390152.

It is an arithmetic number, because the mean of its divisors is an integer number (2176681440).

Almost surely, 2^11971747887 is an apocalyptic number.

11971747887 is a deficient number, since it is larger than the sum of its proper divisors (5441703633).

11971747887 is a wasteful number, since it uses less digits than its factorization.

11971747887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362780253.

The product of its digits is 5531904, while the sum is 60.

The spelling of 11971747887 in words is "eleven billion, nine hundred seventy-one million, seven hundred forty-seven thousand, eight hundred eighty-seven".