11856020999 has 2 divisors, whose sum is σ = 11856021000. Its totient is φ = 11856020998.

The previous prime is 11856020971. The next prime is 11856021007. The reversal of 11856020999 is 99902065811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11856020999 - 2²⁴ = 11839243783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11856020399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5928010499 + 5928010500.

It is an arithmetic number, because the mean of its divisors is an integer number (5928010500).

Almost surely, 2^11856020999 is an apocalyptic number.

11856020999 is a deficient number, since it is larger than the sum of its proper divisors (1).

11856020999 is an equidigital number, since it uses as much as digits as its factorization.

11856020999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 11856020999 in words is "eleven billion, eight hundred fifty-six million, twenty thousand, nine hundred ninety-nine".