406566799481 has 2 divisors, whose sum is σ = 406566799482. Its totient is φ = 406566799480.

The previous prime is 406566799453. The next prime is 406566799489. The reversal of 406566799481 is 184997665604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273852309481 + 132714490000 = 523309^2 + 364300^2 .

It is a cyclic number.

It is not a de Polignac number, because 406566799481 - 2¹⁴ = 406566783097 is a prime.

It is a super-2 number, since 2×406566799481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (406566799489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203283399740 + 203283399741.

It is an arithmetic number, because the mean of its divisors is an integer number (203283399741).

Almost surely, 2^406566799481 is an apocalyptic number.

It is an amenable number.

406566799481 is a deficient number, since it is larger than the sum of its proper divisors (1).

406566799481 is an equidigital number, since it uses as much as digits as its factorization.

406566799481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 406566799481 in words is "four hundred six billion, five hundred sixty-six million, seven hundred ninety-nine thousand, four hundred eighty-one".