161644655026 has 4 divisors (see below), whose sum is σ = 242466982542. Its totient is φ = 80822327512.

The previous prime is 161644654949. The next prime is 161644655069. The reversal of 161644655026 is 620556446161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 109431948025 + 52212707001 = 330805^2 + 228501^2 .

It is a super-2 number, since 2×161644655026² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40411163755 + ... + 40411163758.

Almost surely, 2^161644655026 is an apocalyptic number.

161644655026 is a deficient number, since it is larger than the sum of its proper divisors (80822327516).

161644655026 is an equidigital number, since it uses as much as digits as its factorization.

161644655026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80822327515.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 161644655026 in words is "one hundred sixty-one billion, six hundred forty-four million, six hundred fifty-five thousand, twenty-six".