660504541 has 2 divisors, whose sum is σ = 660504542. Its totient is φ = 660504540.

The previous prime is 660504529. The next prime is 660504557. The reversal of 660504541 is 145405066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633982041 + 26522500 = 25179^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 660504541 - 2⁷ = 660504413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660502541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330252270 + 330252271.

It is an arithmetic number, because the mean of its divisors is an integer number (330252271).

Almost surely, 2^660504541 is an apocalyptic number.

It is an amenable number.

660504541 is a deficient number, since it is larger than the sum of its proper divisors (1).

660504541 is an equidigital number, since it uses as much as digits as its factorization.

660504541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 660504541 is about 25700.2828972757. The cubic root of 660504541 is about 870.8805727315.

The spelling of 660504541 in words is "six hundred sixty million, five hundred four thousand, five hundred forty-one".