661012327 has 2 divisors, whose sum is σ = 661012328. Its totient is φ = 661012326.

The previous prime is 661012321. The next prime is 661012351. The reversal of 661012327 is 723210166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661012327 - 2⁷ = 661012199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661012295 and 661012304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661012321) 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, 330506163 + 330506164.

It is an arithmetic number, because the mean of its divisors is an integer number (330506164).

Almost surely, 2^661012327 is an apocalyptic number.

661012327 is a deficient number, since it is larger than the sum of its proper divisors (1).

661012327 is an equidigital number, since it uses as much as digits as its factorization.

661012327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 661012327 is about 25710.1599956126. The cubic root of 661012327 is about 871.1036888794.

The spelling of 661012327 in words is "six hundred sixty-one million, twelve thousand, three hundred twenty-seven".