661301041 has 2 divisors, whose sum is σ = 661301042. Its totient is φ = 661301040.

The previous prime is 661301033. The next prime is 661301051. The reversal of 661301041 is 140103166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514382400 + 146918641 = 22680^2 + 12121^2 .

It is a cyclic number.

It is not a de Polignac number, because 661301041 - 2³ = 661301033 is a prime.

It is not a weakly prime, because it can be changed into another prime (661301051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330650520 + 330650521.

It is an arithmetic number, because the mean of its divisors is an integer number (330650521).

Almost surely, 2^661301041 is an apocalyptic number.

It is an amenable number.

661301041 is a deficient number, since it is larger than the sum of its proper divisors (1).

661301041 is an equidigital number, since it uses as much as digits as its factorization.

661301041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 661301041 is about 25715.7741668416. The cubic root of 661301041 is about 871.2304960068.

The spelling of 661301041 in words is "six hundred sixty-one million, three hundred one thousand, forty-one".