11787521906 has 8 divisors (see below), whose sum is σ = 17682332400. Its totient is φ = 5893411108.

The previous prime is 11787521903. The next prime is 11787521947. The reversal of 11787521906 is 60912578711.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11787521903) 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, 130556 + ... + 201543.

It is an arithmetic number, because the mean of its divisors is an integer number (2210291550).

Almost surely, 2^11787521906 is an apocalyptic number.

11787521906 is a deficient number, since it is larger than the sum of its proper divisors (5894810494).

11787521906 is a wasteful number, since it uses less digits than its factorization.

11787521906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349848.

The product of its (nonzero) digits is 211680, while the sum is 47.

The spelling of 11787521906 in words is "eleven billion, seven hundred eighty-seven million, five hundred twenty-one thousand, nine hundred six".