661452250187 has 2 divisors, whose sum is σ = 661452250188. Its totient is φ = 661452250186.

The previous prime is 661452250163. The next prime is 661452250219. The reversal of 661452250187 is 781052254166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661452250187 - 2²⁶ = 661385141323 is a prime.

It is not a weakly prime, because it can be changed into another prime (661452250127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330726125093 + 330726125094.

It is an arithmetic number, because the mean of its divisors is an integer number (330726125094).

Almost surely, 2^661452250187 is an apocalyptic number.

661452250187 is a deficient number, since it is larger than the sum of its proper divisors (1).

661452250187 is an equidigital number, since it uses as much as digits as its factorization.

661452250187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 661452250187 in words is "six hundred sixty-one billion, four hundred fifty-two million, two hundred fifty thousand, one hundred eighty-seven".