161421615223 has 8 divisors (see below), whose sum is σ = 176106750336. Its totient is φ = 146738220600.

The previous prime is 161421615221. The next prime is 161421615239. The reversal of 161421615223 is 322516124161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161421615223 - 2¹ = 161421615221 is a prime.

It is a super-2 number, since 2×161421615223² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161421615221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237283 + ... + 615748.

It is an arithmetic number, because the mean of its divisors is an integer number (22013343792).

Almost surely, 2^161421615223 is an apocalyptic number.

161421615223 is a deficient number, since it is larger than the sum of its proper divisors (14685135113).

161421615223 is a wasteful number, since it uses less digits than its factorization.

161421615223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870245.

The product of its digits is 17280, while the sum is 34.

Adding to 161421615223 its reverse (322516124161), we get a palindrome (483937739384).

The spelling of 161421615223 in words is "one hundred sixty-one billion, four hundred twenty-one million, six hundred fifteen thousand, two hundred twenty-three".