405661127321 has 2 divisors, whose sum is σ = 405661127322. Its totient is φ = 405661127320.

The previous prime is 405661127251. The next prime is 405661127329. The reversal of 405661127321 is 123721166504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380121571600 + 25539555721 = 616540^2 + 159811^2 .

It is a cyclic number.

It is not a de Polignac number, because 405661127321 - 2³⁰ = 404587385497 is a prime.

It is not a weakly prime, because it can be changed into another prime (405661127329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202830563660 + 202830563661.

It is an arithmetic number, because the mean of its divisors is an integer number (202830563661).

Almost surely, 2^405661127321 is an apocalyptic number.

It is an amenable number.

405661127321 is a deficient number, since it is larger than the sum of its proper divisors (1).

405661127321 is an equidigital number, since it uses as much as digits as its factorization.

405661127321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 405661127321 in words is "four hundred five billion, six hundred sixty-one million, one hundred twenty-seven thousand, three hundred twenty-one".