13155946820 has 12 divisors (see below), whose sum is σ = 27627488364. Its totient is φ = 5262378720.

The previous prime is 13155946819. The next prime is 13155946823. The reversal of 13155946820 is 2864955131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5749278976 + 7406667844 = 75824^2 + 86062^2 .

It is a super-2 number, since 2×13155946820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13155946823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328898651 + ... + 328898690.

It is an arithmetic number, because the mean of its divisors is an integer number (2302290697).

Almost surely, 2^13155946820 is an apocalyptic number.

13155946820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13155946820 is an abundant number, since it is smaller than the sum of its proper divisors (14471541544).

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

13155946820 is a wasteful number, since it uses less digits than its factorization.

13155946820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657797350 (or 657797348 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 13155946820 in words is "thirteen billion, one hundred fifty-five million, nine hundred forty-six thousand, eight hundred twenty".