161000652221 has 4 divisors (see below), whose sum is σ = 161054340000. Its totient is φ = 160946964444.

The previous prime is 161000652193. The next prime is 161000652227. The reversal of 161000652221 is 122256000161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161000652221 - 2⁶ = 161000652157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161000652227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26839391 + ... + 26845388.

It is an arithmetic number, because the mean of its divisors is an integer number (40263585000).

Almost surely, 2^161000652221 is an apocalyptic number.

It is an amenable number.

161000652221 is a deficient number, since it is larger than the sum of its proper divisors (53687779).

161000652221 is an equidigital number, since it uses as much as digits as its factorization.

161000652221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53687778.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 161000652221 its reverse (122256000161), we get a palindrome (283256652382).

The spelling of 161000652221 in words is "one hundred sixty-one billion, six hundred fifty-two thousand, two hundred twenty-one".