405506782061 has 2 divisors, whose sum is σ = 405506782062. Its totient is φ = 405506782060.

The previous prime is 405506782001. The next prime is 405506782069. The reversal of 405506782061 is 160287605504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270519613225 + 134987168836 = 520115^2 + 367406^2 .

It is a cyclic number.

It is not a de Polignac number, because 405506782061 - 2²² = 405502587757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405506782069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202753391030 + 202753391031.

It is an arithmetic number, because the mean of its divisors is an integer number (202753391031).

Almost surely, 2^405506782061 is an apocalyptic number.

It is an amenable number.

405506782061 is a deficient number, since it is larger than the sum of its proper divisors (1).

405506782061 is an equidigital number, since it uses as much as digits as its factorization.

405506782061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 405506782061 in words is "four hundred five billion, five hundred six million, seven hundred eighty-two thousand, sixty-one".