39924576649 has 2 divisors, whose sum is σ = 39924576650. Its totient is φ = 39924576648.

The previous prime is 39924576623. The next prime is 39924576673. The reversal of 39924576649 is 94667542993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39697773049 + 226803600 = 199243^2 + 15060^2 .

It is a cyclic number.

It is not a de Polignac number, because 39924576649 - 2¹⁷ = 39924445577 is a prime.

It is not a weakly prime, because it can be changed into another prime (39924570649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19962288324 + 19962288325.

It is an arithmetic number, because the mean of its divisors is an integer number (19962288325).

Almost surely, 2^39924576649 is an apocalyptic number.

It is an amenable number.

39924576649 is a deficient number, since it is larger than the sum of its proper divisors (1).

39924576649 is an equidigital number, since it uses as much as digits as its factorization.

39924576649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 64.

The spelling of 39924576649 in words is "thirty-nine billion, nine hundred twenty-four million, five hundred seventy-six thousand, six hundred forty-nine".