661036301 has 2 divisors, whose sum is σ = 661036302. Its totient is φ = 661036300.

The previous prime is 661036297. The next prime is 661036303. The reversal of 661036301 is 103630166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657973801 + 3062500 = 25651^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 661036301 - 2² = 661036297 is a prime.

It is a Sophie Germain prime.

Together with 661036303, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661036303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330518150 + 330518151.

It is an arithmetic number, because the mean of its divisors is an integer number (330518151).

Almost surely, 2^661036301 is an apocalyptic number.

It is an amenable number.

661036301 is a deficient number, since it is larger than the sum of its proper divisors (1).

661036301 is an equidigital number, since it uses as much as digits as its factorization.

661036301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 661036301 is about 25710.6262273014. The cubic root of 661036301 is about 871.1142199928.

Adding to 661036301 its reverse (103630166), we get a palindrome (764666467).

The spelling of 661036301 in words is "six hundred sixty-one million, thirty-six thousand, three hundred one".