13531620644 has 6 divisors (see below), whose sum is σ = 23680336134. Its totient is φ = 6765810320.

The previous prime is 13531620643. The next prime is 13531620721. The reversal of 13531620644 is 44602613531.

It can be written as a sum of positive squares in only one way, i.e., 9918168100 + 3613452544 = 99590^2 + 60112^2 .

It is not an unprimeable number, because it can be changed into a prime (13531620643) 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 as a sum of consecutive naturals, namely, 1691452577 + ... + 1691452584.

It is an arithmetic number, because the mean of its divisors is an integer number (3946722689).

Almost surely, 2^13531620644 is an apocalyptic number.

It is an amenable number.

13531620644 is a deficient number, since it is larger than the sum of its proper divisors (10148715490).

13531620644 is a wasteful number, since it uses less digits than its factorization.

13531620644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382905165 (or 3382905163 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 13531620644 in words is "thirteen billion, five hundred thirty-one million, six hundred twenty thousand, six hundred forty-four".