161339625946 has 4 divisors (see below), whose sum is σ = 242009438922. Its totient is φ = 80669812972.

The previous prime is 161339625913. The next prime is 161339626001. The reversal of 161339625946 is 649526933161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 649526933161 = 41 ⋅15842120321.

It can be written as a sum of positive squares in only one way, i.e., 137760487921 + 23579138025 = 371161^2 + 153555^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40334906485 + ... + 40334906488.

Almost surely, 2^161339625946 is an apocalyptic number.

161339625946 is a deficient number, since it is larger than the sum of its proper divisors (80669812976).

161339625946 is an equidigital number, since it uses as much as digits as its factorization.

161339625946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80669812975.

The product of its digits is 6298560, while the sum is 55.

The spelling of 161339625946 in words is "one hundred sixty-one billion, three hundred thirty-nine million, six hundred twenty-five thousand, nine hundred forty-six".