1001561611016 has 32 divisors (see below), whose sum is σ = 1941710006880. Its totient is φ = 484000579200.

The previous prime is 1001561611009. The next prime is 1001561611049. The reversal of 1001561611016 is 6101161651001.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001561611016.

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 7 ways as a sum of consecutive naturals, for example, 14233790 + ... + 14303981.

It is an arithmetic number, because the mean of its divisors is an integer number (60678437715).

Almost surely, 2^{1001561611016} is an apocalyptic number.

It is an amenable number.

1001561611016 is a deficient number, since it is larger than the sum of its proper divisors (940148395864).

1001561611016 is a wasteful number, since it uses less digits than its factorization.

1001561611016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28537925 (or 28537921 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 29.

The spelling of 1001561611016 in words is "one trillion, one billion, five hundred sixty-one million, six hundred eleven thousand, sixteen".