661245301 has 2 divisors, whose sum is σ = 661245302. Its totient is φ = 661245300.

The previous prime is 661245293. The next prime is 661245317. The reversal of 661245301 is 103542166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537034276 + 124211025 = 23174^2 + 11145^2 .

It is a cyclic number.

It is not a de Polignac number, because 661245301 - 2³ = 661245293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661245301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661245901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330622650 + 330622651.

It is an arithmetic number, because the mean of its divisors is an integer number (330622651).

Almost surely, 2^661245301 is an apocalyptic number.

It is an amenable number.

661245301 is a deficient number, since it is larger than the sum of its proper divisors (1).

661245301 is an equidigital number, since it uses as much as digits as its factorization.

661245301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 661245301 is about 25714.6903734033. The cubic root of 661245301 is about 871.2060171137.

Adding to 661245301 its reverse (103542166), we get a palindrome (764787467).

The spelling of 661245301 in words is "six hundred sixty-one million, two hundred forty-five thousand, three hundred one".