11842612920581 has 2 divisors, whose sum is σ = 11842612920582. Its totient is φ = 11842612920580.

The previous prime is 11842612920571. The next prime is 11842612920583. The reversal of 11842612920581 is 18502921624811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6979286883556 + 4863326037025 = 2641834^2 + 2205295^2 .

It is a cyclic number.

It is not a de Polignac number, because 11842612920581 - 2¹⁴ = 11842612904197 is a prime.

It is a super-2 number, since 2×11842612920581² (a number of 27 digits) contains 22 as substring.

Together with 11842612920583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11842612920583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5921306460290 + 5921306460291.

It is an arithmetic number, because the mean of its divisors is an integer number (5921306460291).

Almost surely, 2^{11842612920581} is an apocalyptic number.

It is an amenable number.

11842612920581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11842612920581 is an equidigital number, since it uses as much as digits as its factorization.

11842612920581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 11842612920581 in words is "eleven trillion, eight hundred forty-two billion, six hundred twelve million, nine hundred twenty thousand, five hundred eighty-one".