402240642169 has 2 divisors, whose sum is σ = 402240642170. Its totient is φ = 402240642168.

The previous prime is 402240642161. The next prime is 402240642227. The reversal of 402240642169 is 961246042204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352640007225 + 49600634944 = 593835^2 + 222712^2 .

It is a cyclic number.

It is not a de Polignac number, because 402240642169 - 2³ = 402240642161 is a prime.

It is a super-2 number, since 2×402240642169² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402240642161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201120321084 + 201120321085.

It is an arithmetic number, because the mean of its divisors is an integer number (201120321085).

Almost surely, 2^402240642169 is an apocalyptic number.

It is an amenable number.

402240642169 is a deficient number, since it is larger than the sum of its proper divisors (1).

402240642169 is an equidigital number, since it uses as much as digits as its factorization.

402240642169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 402240642169 in words is "four hundred two billion, two hundred forty million, six hundred forty-two thousand, one hundred sixty-nine".