161540442202 has 8 divisors (see below), whose sum is σ = 242358937812. Its totient is φ = 80754129600.

The previous prime is 161540442199. The next prime is 161540442281. The reversal of 161540442202 is 202244045161.

It can be written as a sum of positive squares in 2 ways, for example, as 110097212481 + 51443229721 = 331809^2 + 226811^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8033199 + ... + 8053282.

Almost surely, 2^161540442202 is an apocalyptic number.

161540442202 is a deficient number, since it is larger than the sum of its proper divisors (80818495610).

161540442202 is a wasteful number, since it uses less digits than its factorization.

161540442202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16091504.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 161540442202 its reverse (202244045161), we get a palindrome (363784487363).

The spelling of 161540442202 in words is "one hundred sixty-one billion, five hundred forty million, four hundred forty-two thousand, two hundred two".