13550381955 has 24 divisors (see below), whose sum is σ = 25622541360. Its totient is φ = 6569881920.

The previous prime is 13550381939. The next prime is 13550381959. The reversal of 13550381955 is 55918305531.

13550381955 is a `hidden beast` number, since 1 + 3 + 550 + 3 + 8 + 1 + 95 + 5 = 666.

It is not a de Polignac number, because 13550381955 - 2⁴ = 13550381939 is a prime.

It is a super-2 number, since 2×13550381955² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 13550381955.

It is not an unprimeable number, because it can be changed into a prime (13550381959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13686760 + ... + 13687749.

It is an arithmetic number, because the mean of its divisors is an integer number (1067605890).

Almost surely, 2^13550381955 is an apocalyptic number.

13550381955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13550381955 is a deficient number, since it is larger than the sum of its proper divisors (12072159405).

13550381955 is a wasteful number, since it uses less digits than its factorization.

13550381955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27374531 (or 27374528 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 45.

The spelling of 13550381955 in words is "thirteen billion, five hundred fifty million, three hundred eighty-one thousand, nine hundred fifty-five".