661650010039 has 2 divisors, whose sum is σ = 661650010040. Its totient is φ = 661650010038.

The previous prime is 661650010037. The next prime is 661650010069. The reversal of 661650010039 is 930010056166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661650010039 - 2¹ = 661650010037 is a prime.

Together with 661650010037, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661650010033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330825005019 + 330825005020.

It is an arithmetic number, because the mean of its divisors is an integer number (330825005020).

Almost surely, 2^661650010039 is an apocalyptic number.

661650010039 is a deficient number, since it is larger than the sum of its proper divisors (1).

661650010039 is an equidigital number, since it uses as much as digits as its factorization.

661650010039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 661650010039 in words is "six hundred sixty-one billion, six hundred fifty million, ten thousand, thirty-nine".