407665648661 has 2 divisors, whose sum is σ = 407665648662. Its totient is φ = 407665648660.

The previous prime is 407665648619. The next prime is 407665648679. The reversal of 407665648661 is 166846566704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367000909636 + 40664739025 = 605806^2 + 201655^2 .

It is a cyclic number.

It is not a de Polignac number, because 407665648661 - 2¹⁰ = 407665647637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 407665648661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (407665648601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203832824330 + 203832824331.

It is an arithmetic number, because the mean of its divisors is an integer number (203832824331).

Almost surely, 2^407665648661 is an apocalyptic number.

It is an amenable number.

407665648661 is a deficient number, since it is larger than the sum of its proper divisors (1).

407665648661 is an equidigital number, since it uses as much as digits as its factorization.

407665648661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 407665648661 in words is "four hundred seven billion, six hundred sixty-five million, six hundred forty-eight thousand, six hundred sixty-one".