161953243554 has 16 divisors (see below), whose sum is σ = 325969587648. Its totient is φ = 53640564432.

The previous prime is 161953243523. The next prime is 161953243577. The reversal of 161953243554 is 455342359161.

It is a super-2 number, since 2×161953243554² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85961502 + ... + 85963385.

It is an arithmetic number, because the mean of its divisors is an integer number (20373099228).

Almost surely, 2^161953243554 is an apocalyptic number.

161953243554 is an abundant number, since it is smaller than the sum of its proper divisors (164016344094).

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

161953243554 is a wasteful number, since it uses less digits than its factorization.

161953243554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171925049.

The product of its digits is 1944000, while the sum is 48.

The spelling of 161953243554 in words is "one hundred sixty-one billion, nine hundred fifty-three million, two hundred forty-three thousand, five hundred fifty-four".