11921605959 has 8 divisors (see below), whose sum is σ = 15908392192. Its totient is φ = 7941278520.

The previous prime is 11921605931. The next prime is 11921605961. The reversal of 11921605959 is 95950612911.

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

It is not a de Polignac number, because 11921605959 - 2¹³ = 11921597767 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 (11921605919) 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, 1610389 + ... + 1617774.

It is an arithmetic number, because the mean of its divisors is an integer number (1988549024).

Almost surely, 2^11921605959 is an apocalyptic number.

11921605959 is a deficient number, since it is larger than the sum of its proper divisors (3986786233).

11921605959 is a wasteful number, since it uses less digits than its factorization.

11921605959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229397.

The product of its (nonzero) digits is 218700, while the sum is 48.

The spelling of 11921605959 in words is "eleven billion, nine hundred twenty-one million, six hundred five thousand, nine hundred fifty-nine".