163426956121 has 45 divisors (see below), whose sum is σ = 195420985005. Its totient is φ = 136607877120.

The previous prime is 163426956101. The next prime is 163426956127. The reversal of 163426956121 is 121659624361.

The square root of 163426956121 is 404261.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 11623211721 + 151803744400 = 107811^2 + 389620^2 .

It is not a de Polignac number, because 163426956121 - 2⁵ = 163426956089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163426956127) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 635902425 + ... + 635902681.

Almost surely, 2^163426956121 is an apocalyptic number.

163426956121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163426956121 is the 404261-st square number.

163426956121 is the 202131-st centered octagonal number.

It is an amenable number.

163426956121 is a deficient number, since it is larger than the sum of its proper divisors (31994028884).

163426956121 is an frugal number, since it uses more digits than its factorization.

163426956121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 281 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The spelling of 163426956121 in words is "one hundred sixty-three billion, four hundred twenty-six million, nine hundred fifty-six thousand, one hundred twenty-one".