405646239077 has 2 divisors, whose sum is σ = 405646239078. Its totient is φ = 405646239076.

The previous prime is 405646239071. The next prime is 405646239247. The reversal of 405646239077 is 770932646504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308692471201 + 96953767876 = 555601^2 + 311374^2 .

It is a cyclic number.

It is not a de Polignac number, because 405646239077 - 2²⁶ = 405579130213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405646239071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202823119538 + 202823119539.

It is an arithmetic number, because the mean of its divisors is an integer number (202823119539).

Almost surely, 2^405646239077 is an apocalyptic number.

It is an amenable number.

405646239077 is a deficient number, since it is larger than the sum of its proper divisors (1).

405646239077 is an equidigital number, since it uses as much as digits as its factorization.

405646239077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 405646239077 in words is "four hundred five billion, six hundred forty-six million, two hundred thirty-nine thousand, seventy-seven".