39919966523 has 2 divisors, whose sum is σ = 39919966524. Its totient is φ = 39919966522.

The previous prime is 39919966469. The next prime is 39919966543. The reversal of 39919966523 is 32566991993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39919966523 - 2¹⁴ = 39919950139 is a prime.

It is not a weakly prime, because it can be changed into another prime (39919966543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19959983261 + 19959983262.

It is an arithmetic number, because the mean of its divisors is an integer number (19959983262).

Almost surely, 2^39919966523 is an apocalyptic number.

39919966523 is a deficient number, since it is larger than the sum of its proper divisors (1).

39919966523 is an equidigital number, since it uses as much as digits as its factorization.

39919966523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21257640, while the sum is 62.

The spelling of 39919966523 in words is "thirty-nine billion, nine hundred nineteen million, nine hundred sixty-six thousand, five hundred twenty-three".