161043005621025 has 144 divisors (see below), whose sum is σ = 319125622652928. Its totient is φ = 76975590384000.

The previous prime is 161043005620979. The next prime is 161043005621033. The reversal of 161043005621025 is 520126500340161.

161043005621025 is a `hidden beast` number, since 1 + 6 + 1 + 0 + 4 + 3 + 0 + 0 + 5 + 621 + 0 + 25 = 666.

161043005621025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161043005621025 - 2¹¹ = 161043005618977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2833888662 + ... + 2833945488.

It is an arithmetic number, because the mean of its divisors is an integer number (2216150157312).

Almost surely, 2^{161043005621025} is an apocalyptic number.

161043005621025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161043005621025 is a deficient number, since it is larger than the sum of its proper divisors (158082617031903).

161043005621025 is a wasteful number, since it uses less digits than its factorization.

161043005621025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73052 (or 73044 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 161043005621025 its reverse (520126500340161), we get a palindrome (681169505961186).

The spelling of 161043005621025 in words is "one hundred sixty-one trillion, forty-three billion, five million, six hundred twenty-one thousand, twenty-five".