11956143019 has 4 divisors (see below), whose sum is σ = 11957340744. Its totient is φ = 11954945296.

The previous prime is 11956143011. The next prime is 11956143049. The reversal of 11956143019 is 91034165911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11956143019 - 2³ = 11956143011 is a prime.

It is a super-2 number, since 2×11956143019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11956143011) 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, 583762 + ... + 603895.

It is an arithmetic number, because the mean of its divisors is an integer number (2989335186).

Almost surely, 2^11956143019 is an apocalyptic number.

11956143019 is a deficient number, since it is larger than the sum of its proper divisors (1197725).

11956143019 is a wasteful number, since it uses less digits than its factorization.

11956143019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197724.

The product of its (nonzero) digits is 29160, while the sum is 40.

The spelling of 11956143019 in words is "eleven billion, nine hundred fifty-six million, one hundred forty-three thousand, nineteen".