60660605551661 has 2 divisors, whose sum is σ = 60660605551662. Its totient is φ = 60660605551660.

The previous prime is 60660605551657. The next prime is 60660605551669. The reversal of 60660605551661 is 16615550606606.

It is a happy number.

60660605551661 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., 53337460562500 + 7323144989161 = 7303250^2 + 2706131^2 .

It is a cyclic number.

It is not a de Polignac number, because 60660605551661 - 2² = 60660605551657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60660605551669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30330302775830 + 30330302775831.

It is an arithmetic number, because the mean of its divisors is an integer number (30330302775831).

Almost surely, 2^{60660605551661} is an apocalyptic number.

It is an amenable number.

60660605551661 is a deficient number, since it is larger than the sum of its proper divisors (1).

60660605551661 is an equidigital number, since it uses as much as digits as its factorization.

60660605551661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 60660605551661 in words is "sixty trillion, six hundred sixty billion, six hundred five million, five hundred fifty-one thousand, six hundred sixty-one".