1561665267144 has 48 divisors (see below), whose sum is σ = 4233976503120. Its totient is φ = 520005377760.

The previous prime is 1561665267139. The next prime is 1561665267167. The reversal of 1561665267144 is 4417625661651.

1561665267144 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 6 + 6 + 526 + 71 + 44 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11383662 + ... + 11520029.

It is an arithmetic number, because the mean of its divisors is an integer number (88207843815).

Almost surely, 2^{1561665267144} is an apocalyptic number.

It is an amenable number.

1561665267144 is an abundant number, since it is smaller than the sum of its proper divisors (2672311235976).

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

1561665267144 is a wasteful number, since it uses less digits than its factorization.

1561665267144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22904650 (or 22904643 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 1561665267144 in words is "one trillion, five hundred sixty-one billion, six hundred sixty-five million, two hundred sixty-seven thousand, one hundred forty-four".