161571600026 has 8 divisors (see below), whose sum is σ = 243051834900. Its totient is φ = 80554321728.

The previous prime is 161571600019. The next prime is 161571600049. The reversal of 161571600026 is 620006175161.

It can be written as a sum of positive squares in 2 ways, for example, as 159321520801 + 2250079225 = 399151^2 + 47435^2 .

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

It is a super-2 number, since 2×161571600026² (a number of 23 digits) contains 22 as substring.

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, 115738271 + ... + 115739666.

Almost surely, 2^161571600026 is an apocalyptic number.

161571600026 is a deficient number, since it is larger than the sum of its proper divisors (81480234874).

161571600026 is a wasteful number, since it uses less digits than its factorization.

161571600026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231478288.

The product of its (nonzero) digits is 15120, while the sum is 35.

Adding to 161571600026 its reverse (620006175161), we get a palindrome (781577775187).

The spelling of 161571600026 in words is "one hundred sixty-one billion, five hundred seventy-one million, six hundred thousand, twenty-six".