11858921537 has 2 divisors, whose sum is σ = 11858921538. Its totient is φ = 11858921536.

The previous prime is 11858921533. The next prime is 11858921579. The reversal of 11858921537 is 73512985811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6336796816 + 5522124721 = 79604^2 + 74311^2 .

It is a cyclic number.

It is not a de Polignac number, because 11858921537 - 2² = 11858921533 is a prime.

It is not a weakly prime, because it can be changed into another prime (11858921533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5929460768 + 5929460769.

It is an arithmetic number, because the mean of its divisors is an integer number (5929460769).

Almost surely, 2^11858921537 is an apocalyptic number.

It is an amenable number.

11858921537 is a deficient number, since it is larger than the sum of its proper divisors (1).

11858921537 is an equidigital number, since it uses as much as digits as its factorization.

11858921537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 50.

The spelling of 11858921537 in words is "eleven billion, eight hundred fifty-eight million, nine hundred twenty-one thousand, five hundred thirty-seven".