60666665621 has 2 divisors, whose sum is σ = 60666665622. Its totient is φ = 60666665620.

The previous prime is 60666665597. The next prime is 60666665629. The reversal of 60666665621 is 12656666606.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49936606225 + 10730059396 = 223465^2 + 103586^2 .

It is a cyclic number.

It is not a de Polignac number, because 60666665621 - 2²⁶ = 60599556757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 60666665621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60666665629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30333332810 + 30333332811.

It is an arithmetic number, because the mean of its divisors is an integer number (30333332811).

Almost surely, 2^60666665621 is an apocalyptic number.

It is an amenable number.

60666665621 is a deficient number, since it is larger than the sum of its proper divisors (1).

60666665621 is an equidigital number, since it uses as much as digits as its factorization.

60666665621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 60666665621 in words is "sixty billion, six hundred sixty-six million, six hundred sixty-five thousand, six hundred twenty-one".