661012301 has 2 divisors, whose sum is σ = 661012302. Its totient is φ = 661012300.

The previous prime is 661012279. The next prime is 661012307. The reversal of 661012301 is 103210166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536154025 + 124858276 = 23155^2 + 11174^2 .

It is a cyclic number.

It is not a de Polignac number, because 661012301 - 2¹⁴ = 660995917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661012307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330506150 + 330506151.

It is an arithmetic number, because the mean of its divisors is an integer number (330506151).

Almost surely, 2^661012301 is an apocalyptic number.

It is an amenable number.

661012301 is a deficient number, since it is larger than the sum of its proper divisors (1).

661012301 is an equidigital number, since it uses as much as digits as its factorization.

661012301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 661012301 is about 25710.1594899759. The cubic root of 661012301 is about 871.1036774582.

Adding to 661012301 its reverse (103210166), we get a palindrome (764222467).

It can be divided in two parts, 66 and 1012301, that multiplied together give a palindrome (66811866).

The spelling of 661012301 in words is "six hundred sixty-one million, twelve thousand, three hundred one".