161000525421 has 8 divisors (see below), whose sum is σ = 238519296960. Its totient is φ = 107333683596.

The previous prime is 161000525419. The next prime is 161000525437. The reversal of 161000525421 is 124525000161.

161000525421 is a `hidden beast` number, since 1 + 610 + 0 + 0 + 5 + 2 + 5 + 42 + 1 = 666.

161000525421 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 161000525421 - 2¹ = 161000525419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5962982423 = 161000525421 / (1 + 6 + 1 + 0 + 0 + 0 + 5 + 2 + 5 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161000595421) by changing a digit.

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, 2981491185 + ... + 2981491238.

It is an arithmetic number, because the mean of its divisors is an integer number (29814912120).

Almost surely, 2^161000525421 is an apocalyptic number.

It is an amenable number.

161000525421 is a deficient number, since it is larger than the sum of its proper divisors (77518771539).

161000525421 is an equidigital number, since it uses as much as digits as its factorization.

161000525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962982432 (or 5962982426 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 161000525421 its reverse (124525000161), we get a palindrome (285525525582).

The spelling of 161000525421 in words is "one hundred sixty-one billion, five hundred twenty-five thousand, four hundred twenty-one".