652400615026661 has 2 divisors, whose sum is σ = 652400615026662. Its totient is φ = 652400615026660.

The previous prime is 652400615026631. The next prime is 652400615026679. The reversal of 652400615026661 is 166620516004256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594207365624161 + 58193249402500 = 24376369^2 + 7628450^2 .

It is a cyclic number.

It is not a de Polignac number, because 652400615026661 - 2²² = 652400610832357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652400615026631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326200307513330 + 326200307513331.

It is an arithmetic number, because the mean of its divisors is an integer number (326200307513331).

Almost surely, 2^{652400615026661} is an apocalyptic number.

It is an amenable number.

652400615026661 is a deficient number, since it is larger than the sum of its proper divisors (1).

652400615026661 is an equidigital number, since it uses as much as digits as its factorization.

652400615026661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 652400615026661 in words is "six hundred fifty-two trillion, four hundred billion, six hundred fifteen million, twenty-six thousand, six hundred sixty-one".