660120641 has 2 divisors, whose sum is σ = 660120642. Its totient is φ = 660120640.

The previous prime is 660120619. The next prime is 660120653. The reversal of 660120641 is 146021066.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 603930625 + 56190016 = 24575^2 + 7496^2 .

It is a cyclic number.

It is not a de Polignac number, because 660120641 - 2⁶ = 660120577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660120641.

It is not a weakly prime, because it can be changed into another prime (660120661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330060320 + 330060321.

It is an arithmetic number, because the mean of its divisors is an integer number (330060321).

Almost surely, 2^660120641 is an apocalyptic number.

It is an amenable number.

660120641 is a deficient number, since it is larger than the sum of its proper divisors (1).

660120641 is an equidigital number, since it uses as much as digits as its factorization.

660120641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 660120641 is about 25692.8130223220. The cubic root of 660120641 is about 870.7118149483.

The spelling of 660120641 in words is "six hundred sixty million, one hundred twenty thousand, six hundred forty-one".