13500420644 has 12 divisors (see below), whose sum is σ = 23665581324. Its totient is φ = 6738825984.

The previous prime is 13500420643. The next prime is 13500420691. The reversal of 13500420644 is 44602400531.

It can be written as a sum of positive squares in 2 ways, for example, as 9231366400 + 4269054244 = 96080^2 + 65338^2 .

It is a super-2 number, since 2×13500420644² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13500420643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2843417 + ... + 2848160.

It is an arithmetic number, because the mean of its divisors is an integer number (1972131777).

Almost surely, 2^13500420644 is an apocalyptic number.

It is an amenable number.

13500420644 is a deficient number, since it is larger than the sum of its proper divisors (10165160680).

13500420644 is a wasteful number, since it uses less digits than its factorization.

13500420644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692174 (or 5692172 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 13500420644 in words is "thirteen billion, five hundred million, four hundred twenty thousand, six hundred forty-four".