161803650826 has 8 divisors (see below), whose sum is σ = 246684254724. Its totient is φ = 79575565920.

The previous prime is 161803650769. The next prime is 161803650829. The reversal of 161803650826 is 628056308161.

It can be written as a sum of positive squares in 2 ways, for example, as 161281756801 + 521894025 = 401599^2 + 22845^2 .

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

It is not an unprimeable number, because it can be changed into a prime (161803650829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663129595 + ... + 663129838.

Almost surely, 2^161803650826 is an apocalyptic number.

161803650826 is a deficient number, since it is larger than the sum of its proper divisors (84880603898).

161803650826 is a wasteful number, since it uses less digits than its factorization.

161803650826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326259496.

The product of its (nonzero) digits is 414720, while the sum is 46.

Adding to 161803650826 its reverse (628056308161), we get a palindrome (789859958987).

The spelling of 161803650826 in words is "one hundred sixty-one billion, eight hundred three million, six hundred fifty thousand, eight hundred twenty-six".