13855431997 has 8 divisors (see below), whose sum is σ = 15910544160. Its totient is φ = 11932907760.

The previous prime is 13855431991. The next prime is 13855432009. The reversal of 13855431997 is 79913455831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13855431997 - 2¹¹ = 13855429949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13855431991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33146758 + ... + 33147175.

It is an arithmetic number, because the mean of its divisors is an integer number (1988818020).

Almost surely, 2^13855431997 is an apocalyptic number.

It is an amenable number.

13855431997 is a deficient number, since it is larger than the sum of its proper divisors (2055112163).

13855431997 is a wasteful number, since it uses less digits than its factorization.

13855431997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66293963.

The product of its digits is 4082400, while the sum is 55.

The spelling of 13855431997 in words is "thirteen billion, eight hundred fifty-five million, four hundred thirty-one thousand, nine hundred ninety-seven".