39918334849 has 2 divisors, whose sum is σ = 39918334850. Its totient is φ = 39918334848.

The previous prime is 39918334823. The next prime is 39918334853. The reversal of 39918334849 is 94843381993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25418562624 + 14499772225 = 159432^2 + 120415^2 .

It is a cyclic number.

It is not a de Polignac number, because 39918334849 - 2²⁹ = 39381463937 is a prime.

It is not a weakly prime, because it can be changed into another prime (39918334879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19959167424 + 19959167425.

It is an arithmetic number, because the mean of its divisors is an integer number (19959167425).

Almost surely, 2^39918334849 is an apocalyptic number.

It is an amenable number.

39918334849 is a deficient number, since it is larger than the sum of its proper divisors (1).

39918334849 is an equidigital number, since it uses as much as digits as its factorization.

39918334849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 61.

The spelling of 39918334849 in words is "thirty-nine billion, nine hundred eighteen million, three hundred thirty-four thousand, eight hundred forty-nine".