661460340973 has 2 divisors, whose sum is σ = 661460340974. Its totient is φ = 661460340972.

The previous prime is 661460340929. The next prime is 661460341043. The reversal of 661460340973 is 379043064166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599512615524 + 61947725449 = 774282^2 + 248893^2 .

It is a cyclic number.

It is not a de Polignac number, because 661460340973 - 2¹³ = 661460332781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661460341973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330730170486 + 330730170487.

It is an arithmetic number, because the mean of its divisors is an integer number (330730170487).

Almost surely, 2^661460340973 is an apocalyptic number.

It is an amenable number.

661460340973 is a deficient number, since it is larger than the sum of its proper divisors (1).

661460340973 is an equidigital number, since it uses as much as digits as its factorization.

661460340973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 49.

The spelling of 661460340973 in words is "six hundred sixty-one billion, four hundred sixty million, three hundred forty thousand, nine hundred seventy-three".