161855201524 has 12 divisors (see below), whose sum is σ = 289273126464. Its totient is φ = 79205736824.

The previous prime is 161855201513. The next prime is 161855201533. The reversal of 161855201524 is 425102558161.

161855201524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 430465774 + ... + 430466149.

It is an arithmetic number, because the mean of its divisors is an integer number (24106093872).

Almost surely, 2^161855201524 is an apocalyptic number.

It is an amenable number.

161855201524 is a deficient number, since it is larger than the sum of its proper divisors (127417924940).

161855201524 is a wasteful number, since it uses less digits than its factorization.

161855201524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860931974 (or 860931972 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

Adding to 161855201524 its reverse (425102558161), we get a palindrome (586957759685).

The spelling of 161855201524 in words is "one hundred sixty-one billion, eight hundred fifty-five million, two hundred one thousand, five hundred twenty-four".