661452250037 has 2 divisors, whose sum is σ = 661452250038. Its totient is φ = 661452250036.

The previous prime is 661452250021. The next prime is 661452250097. The reversal of 661452250037 is 730052254166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648281015281 + 13171234756 = 805159^2 + 114766^2 .

It is a cyclic number.

It is not a de Polignac number, because 661452250037 - 2⁴ = 661452250021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661452249976 and 661452250003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661452250097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330726125018 + 330726125019.

It is an arithmetic number, because the mean of its divisors is an integer number (330726125019).

Almost surely, 2^661452250037 is an apocalyptic number.

It is an amenable number.

661452250037 is a deficient number, since it is larger than the sum of its proper divisors (1).

661452250037 is an equidigital number, since it uses as much as digits as its factorization.

661452250037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 661452250037 in words is "six hundred sixty-one billion, four hundred fifty-two million, two hundred fifty thousand, thirty-seven".