406440266653 has 2 divisors, whose sum is σ = 406440266654. Its totient is φ = 406440266652.

The previous prime is 406440266611. The next prime is 406440266663. The reversal of 406440266653 is 356662044604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374498713369 + 31941553284 = 611963^2 + 178722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406440266653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406440266663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203220133326 + 203220133327.

It is an arithmetic number, because the mean of its divisors is an integer number (203220133327).

Almost surely, 2^406440266653 is an apocalyptic number.

It is an amenable number.

406440266653 is a deficient number, since it is larger than the sum of its proper divisors (1).

406440266653 is an equidigital number, since it uses as much as digits as its factorization.

406440266653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 46.

The spelling of 406440266653 in words is "four hundred six billion, four hundred forty million, two hundred sixty-six thousand, six hundred fifty-three".