661082885039 has 2 divisors, whose sum is σ = 661082885040. Its totient is φ = 661082885038.

The previous prime is 661082885017. The next prime is 661082885107. The reversal of 661082885039 is 930588280166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661082885039 - 2²⁰ = 661081836463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661081885039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330541442519 + 330541442520.

It is an arithmetic number, because the mean of its divisors is an integer number (330541442520).

Almost surely, 2^661082885039 is an apocalyptic number.

661082885039 is a deficient number, since it is larger than the sum of its proper divisors (1).

661082885039 is an equidigital number, since it uses as much as digits as its factorization.

661082885039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 661082885039 in words is "six hundred sixty-one billion, eighty-two million, eight hundred eighty-five thousand, thirty-nine".