661424017 has 2 divisors, whose sum is σ = 661424018. Its totient is φ = 661424016.

The previous prime is 661424003. The next prime is 661424051. The reversal of 661424017 is 710424166.

661424017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649026576 + 12397441 = 25476^2 + 3521^2 .

It is a cyclic number.

It is not a de Polignac number, because 661424017 - 2¹⁵ = 661391249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661424017.

It is not a weakly prime, because it can be changed into another prime (661424077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330712008 + 330712009.

It is an arithmetic number, because the mean of its divisors is an integer number (330712009).

Almost surely, 2^661424017 is an apocalyptic number.

It is an amenable number.

661424017 is a deficient number, since it is larger than the sum of its proper divisors (1).

661424017 is an equidigital number, since it uses as much as digits as its factorization.

661424017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 661424017 is about 25718.1651172863. The cubic root of 661424017 is about 871.2844975352.

The spelling of 661424017 in words is "six hundred sixty-one million, four hundred twenty-four thousand, seventeen".