661036351 has 2 divisors, whose sum is σ = 661036352. Its totient is φ = 661036350.

The previous prime is 661036331. The next prime is 661036357. The reversal of 661036351 is 153630166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661036351 - 2⁹ = 661035839 is a prime.

It is equal to p_34337254 and since 661036351 and 34337254 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661036357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330518175 + 330518176.

It is an arithmetic number, because the mean of its divisors is an integer number (330518176).

Almost surely, 2^661036351 is an apocalyptic number.

661036351 is a deficient number, since it is larger than the sum of its proper divisors (1).

661036351 is an equidigital number, since it uses as much as digits as its factorization.

661036351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 661036351 is about 25710.6271996620. The cubic root of 661036351 is about 871.1142419562.

The spelling of 661036351 in words is "six hundred sixty-one million, thirty-six thousand, three hundred fifty-one".