15561342542644 has 6 divisors (see below), whose sum is σ = 27232349449634. Its totient is φ = 7780671271320.

The previous prime is 15561342542623. The next prime is 15561342542653. The reversal of 15561342542644 is 44624524316551.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15275684361744 + 285658180900 = 3908412^2 + 534470^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15561342542591 and 15561342542600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945167817827 + ... + 1945167817834.

Almost surely, 2^{15561342542644} is an apocalyptic number.

It is an amenable number.

15561342542644 is a deficient number, since it is larger than the sum of its proper divisors (11671006906990).

15561342542644 is a wasteful number, since it uses less digits than its factorization.

15561342542644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890335635665 (or 3890335635663 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 52.

The spelling of 15561342542644 in words is "fifteen trillion, five hundred sixty-one billion, three hundred forty-two million, five hundred forty-two thousand, six hundred forty-four".