660651461 has 2 divisors, whose sum is σ = 660651462. Its totient is φ = 660651460.

The previous prime is 660651457. The next prime is 660651463. The reversal of 660651461 is 164156066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643890625 + 16760836 = 25375^2 + 4094^2 .

It is a cyclic number.

It is not a de Polignac number, because 660651461 - 2² = 660651457 is a prime.

Together with 660651463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660651463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330325730 + 330325731.

It is an arithmetic number, because the mean of its divisors is an integer number (330325731).

Almost surely, 2^660651461 is an apocalyptic number.

It is an amenable number.

660651461 is a deficient number, since it is larger than the sum of its proper divisors (1).

660651461 is an equidigital number, since it uses as much as digits as its factorization.

660651461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 660651461 is about 25703.1410726394. The cubic root of 660651461 is about 870.9451396800.

The spelling of 660651461 in words is "six hundred sixty million, six hundred fifty-one thousand, four hundred sixty-one".