39660732509 has 2 divisors, whose sum is σ = 39660732510. Its totient is φ = 39660732508.

The previous prime is 39660732467. The next prime is 39660732511. The reversal of 39660732509 is 90523706693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30305587225 + 9355145284 = 174085^2 + 96722^2 .

It is a cyclic number.

It is not a de Polignac number, because 39660732509 - 2¹² = 39660728413 is a prime.

Together with 39660732511, 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 (39660732569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19830366254 + 19830366255.

It is an arithmetic number, because the mean of its divisors is an integer number (19830366255).

Almost surely, 2^39660732509 is an apocalyptic number.

It is an amenable number.

39660732509 is a deficient number, since it is larger than the sum of its proper divisors (1).

39660732509 is an equidigital number, since it uses as much as digits as its factorization.

39660732509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 50.

The spelling of 39660732509 in words is "thirty-nine billion, six hundred sixty million, seven hundred thirty-two thousand, five hundred nine".