161131556024 has 8 divisors (see below), whose sum is σ = 302121667560. Its totient is φ = 80565778008.

The previous prime is 161131555993. The next prime is 161131556063. The reversal of 161131556024 is 420655131161.

It is a tau number, because it is divible by the number of its divisors (8).

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, 10070722244 + ... + 10070722259.

It is an arithmetic number, because the mean of its divisors is an integer number (37765208445).

Almost surely, 2^161131556024 is an apocalyptic number.

It is an amenable number.

161131556024 is a deficient number, since it is larger than the sum of its proper divisors (140990111536).

161131556024 is a wasteful number, since it uses less digits than its factorization.

161131556024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20141444509 (or 20141444505 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 161131556024 its reverse (420655131161), we get a palindrome (581786687185).

The spelling of 161131556024 in words is "one hundred sixty-one billion, one hundred thirty-one million, five hundred fifty-six thousand, twenty-four".