13898555805 has 64 divisors (see below), whose sum is σ = 24239554560. Its totient is φ = 6778818816.

The previous prime is 13898555789. The next prime is 13898555809. The reversal of 13898555805 is 50855589831.

It is a happy number.

It is not a de Polignac number, because 13898555805 - 2⁴ = 13898555789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13898555809) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1023772 + ... + 1037258.

It is an arithmetic number, because the mean of its divisors is an integer number (378743040).

Almost surely, 2^13898555805 is an apocalyptic number.

13898555805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13898555805 is a deficient number, since it is larger than the sum of its proper divisors (10340998755).

13898555805 is a wasteful number, since it uses less digits than its factorization.

13898555805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13650.

The product of its (nonzero) digits is 8640000, while the sum is 57.

The spelling of 13898555805 in words is "thirteen billion, eight hundred ninety-eight million, five hundred fifty-five thousand, eight hundred five".