161355571226 has 8 divisors (see below), whose sum is σ = 242090439444. Its totient is φ = 80658758080.

The previous prime is 161355571211. The next prime is 161355571231. The reversal of 161355571226 is 622175553161.

It can be written as a sum of positive squares in 2 ways, for example, as 141187311001 + 20168260225 = 375749^2 + 142015^2 .

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, 9503165 + ... + 9520128.

Almost surely, 2^161355571226 is an apocalyptic number.

161355571226 is a deficient number, since it is larger than the sum of its proper divisors (80734868218).

161355571226 is a wasteful number, since it uses less digits than its factorization.

161355571226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19027536.

The product of its digits is 378000, while the sum is 44.

The spelling of 161355571226 in words is "one hundred sixty-one billion, three hundred fifty-five million, five hundred seventy-one thousand, two hundred twenty-six".