13456421543988 has 18 divisors (see below), whose sum is σ = 34014843347394. Its totient is φ = 4485473847984.

The previous prime is 13456421543959. The next prime is 13456421544011. The reversal of 13456421543988 is 88934512465431.

It is a happy number.

13456421543988 is a `hidden beast` number, since 1 + 3 + 4 + 5 + 6 + 4 + 2 + 1 + 543 + 9 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13184175524004 + 272246019984 = 3631002^2 + 521772^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 186894743631 + ... + 186894743702.

Almost surely, 2^{13456421543988} is an apocalyptic number.

13456421543988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13456421543988 is an abundant number, since it is smaller than the sum of its proper divisors (20558421803406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13456421543988 is a wasteful number, since it uses less digits than its factorization.

13456421543988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373789487343 (or 373789487338 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 63.

The spelling of 13456421543988 in words is "thirteen trillion, four hundred fifty-six billion, four hundred twenty-one million, five hundred forty-three thousand, nine hundred eighty-eight".