13155331440 has 80 divisors (see below), whose sum is σ = 41041399968. Its totient is φ = 3485733888.

The previous prime is 13155331439. The next prime is 13155331529. The reversal of 13155331440 is 4413355131.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 13155331398 and 13155331407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136887 + ... + 212246.

Almost surely, 2^13155331440 is an apocalyptic number.

13155331440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13155331440 is an abundant number, since it is smaller than the sum of its proper divisors (27886068528).

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

13155331440 is a wasteful number, since it uses less digits than its factorization.

13155331440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349306 (or 349300 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 13155331440 its reverse (4413355131), we get a palindrome (17568686571).

The spelling of 13155331440 in words is "thirteen billion, one hundred fifty-five million, three hundred thirty-one thousand, four hundred forty".