661802965319 has 2 divisors, whose sum is σ = 661802965320. Its totient is φ = 661802965318.

The previous prime is 661802965309. The next prime is 661802965337. The reversal of 661802965319 is 913569208166.

661802965319 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661802965319 - 2¹² = 661802961223 is a prime.

It is a super-2 number, since 2×661802965319² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661802965309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330901482659 + 330901482660.

It is an arithmetic number, because the mean of its divisors is an integer number (330901482660).

Almost surely, 2^661802965319 is an apocalyptic number.

661802965319 is a deficient number, since it is larger than the sum of its proper divisors (1).

661802965319 is an equidigital number, since it uses as much as digits as its factorization.

661802965319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 661802965319 in words is "six hundred sixty-one billion, eight hundred two million, nine hundred sixty-five thousand, three hundred nineteen".