39997550557 has 2 divisors, whose sum is σ = 39997550558. Its totient is φ = 39997550556.

The previous prime is 39997550543. The next prime is 39997550599. The reversal of 39997550557 is 75505579993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39963608281 + 33942276 = 199909^2 + 5826^2 .

It is a cyclic number.

It is not a de Polignac number, because 39997550557 - 2²⁷ = 39863332829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39997550507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19998775278 + 19998775279.

It is an arithmetic number, because the mean of its divisors is an integer number (19998775279).

Almost surely, 2^39997550557 is an apocalyptic number.

It is an amenable number.

39997550557 is a deficient number, since it is larger than the sum of its proper divisors (1).

39997550557 is an equidigital number, since it uses as much as digits as its factorization.

39997550557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66976875, while the sum is 64.

The spelling of 39997550557 in words is "thirty-nine billion, nine hundred ninety-seven million, five hundred fifty thousand, five hundred fifty-seven".