535979807981 has 2 divisors, whose sum is σ = 535979807982. Its totient is φ = 535979807980.

The previous prime is 535979807959. The next prime is 535979808061. The reversal of 535979807981 is 189708979535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455984170756 + 79995637225 = 675266^2 + 282835^2 .

It is a cyclic number.

It is not a de Polignac number, because 535979807981 - 2⁶ = 535979807917 is a prime.

It is a super-2 number, since 2×535979807981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (535979807681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267989903990 + 267989903991.

It is an arithmetic number, because the mean of its divisors is an integer number (267989903991).

Almost surely, 2^535979807981 is an apocalyptic number.

It is an amenable number.

535979807981 is a deficient number, since it is larger than the sum of its proper divisors (1).

535979807981 is an equidigital number, since it uses as much as digits as its factorization.

535979807981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 171460800, while the sum is 71.

The spelling of 535979807981 in words is "five hundred thirty-five billion, nine hundred seventy-nine million, eight hundred seven thousand, nine hundred eighty-one".