661452443 has 2 divisors, whose sum is σ = 661452444. Its totient is φ = 661452442.

The previous prime is 661452437. The next prime is 661452499. The reversal of 661452443 is 344254166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661452443 is a prime.

It is not a weakly prime, because it can be changed into another prime (661452413) 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, 330726221 + 330726222.

It is an arithmetic number, because the mean of its divisors is an integer number (330726222).

Almost surely, 2^661452443 is an apocalyptic number.

661452443 is a deficient number, since it is larger than the sum of its proper divisors (1).

661452443 is an equidigital number, since it uses as much as digits as its factorization.

661452443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 35.

The square root of 661452443 is about 25718.7177557514. The cubic root of 661452443 is about 871.2969790789.

The spelling of 661452443 in words is "six hundred sixty-one million, four hundred fifty-two thousand, four hundred forty-three".