661427014249 has 2 divisors, whose sum is σ = 661427014250. Its totient is φ = 661427014248.

The previous prime is 661427014201. The next prime is 661427014253. The reversal of 661427014249 is 942410724166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450015572224 + 211411442025 = 670832^2 + 459795^2 .

It is a cyclic number.

It is not a de Polignac number, because 661427014249 - 2¹⁹ = 661426489961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661427014199 and 661427014208.

It is not a weakly prime, because it can be changed into another prime (661427014649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330713507124 + 330713507125.

It is an arithmetic number, because the mean of its divisors is an integer number (330713507125).

Almost surely, 2^661427014249 is an apocalyptic number.

It is an amenable number.

661427014249 is a deficient number, since it is larger than the sum of its proper divisors (1).

661427014249 is an equidigital number, since it uses as much as digits as its factorization.

661427014249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 661427014249 in words is "six hundred sixty-one billion, four hundred twenty-seven million, fourteen thousand, two hundred forty-nine".