20155616439 has 12 divisors (see below), whose sum is σ = 31261772664. Its totient is φ = 11517495024.

The previous prime is 20155616413. The next prime is 20155616443. The reversal of 20155616439 is 93461655102.

It is not a de Polignac number, because 20155616439 - 2⁸ = 20155616183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20155616439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155606439) 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 in 11 ways as a sum of consecutive naturals, for example, 68556372 + ... + 68556665.

It is an arithmetic number, because the mean of its divisors is an integer number (2605147722).

Almost surely, 2^20155616439 is an apocalyptic number.

20155616439 is a deficient number, since it is larger than the sum of its proper divisors (11106156225).

20155616439 is a wasteful number, since it uses less digits than its factorization.

20155616439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137113054 (or 137113047 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20155616439 in words is "twenty billion, one hundred fifty-five million, six hundred sixteen thousand, four hundred thirty-nine".