39661625687 has 2 divisors, whose sum is σ = 39661625688. Its totient is φ = 39661625686.

The previous prime is 39661625603. The next prime is 39661625741. The reversal of 39661625687 is 78652616693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39661625687 - 2³⁴ = 22481756503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39661624687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19830812843 + 19830812844.

It is an arithmetic number, because the mean of its divisors is an integer number (19830812844).

Almost surely, 2^39661625687 is an apocalyptic number.

39661625687 is a deficient number, since it is larger than the sum of its proper divisors (1).

39661625687 is an equidigital number, since it uses as much as digits as its factorization.

39661625687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 59.

The spelling of 39661625687 in words is "thirty-nine billion, six hundred sixty-one million, six hundred twenty-five thousand, six hundred eighty-seven".