356040666581 has 2 divisors, whose sum is σ = 356040666582. Its totient is φ = 356040666580.

The previous prime is 356040666511. The next prime is 356040666589. The reversal of 356040666581 is 185666040653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262379572900 + 93661093681 = 512230^2 + 306041^2 .

It is an emirp because it is prime and its reverse (185666040653) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 356040666581 - 2²⁶ = 355973557717 is a prime.

It is a super-2 number, since 2×356040666581² (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 (356040666589) 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, 178020333290 + 178020333291.

It is an arithmetic number, because the mean of its divisors is an integer number (178020333291).

Almost surely, 2^356040666581 is an apocalyptic number.

It is an amenable number.

356040666581 is a deficient number, since it is larger than the sum of its proper divisors (1).

356040666581 is an equidigital number, since it uses as much as digits as its factorization.

356040666581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 356040666581 in words is "three hundred fifty-six billion, forty million, six hundred sixty-six thousand, five hundred eighty-one".