162643722121 has 4 divisors (see below), whose sum is σ = 162645693700. Its totient is φ = 162641750544.

The previous prime is 162643722113. The next prime is 162643722127. The reversal of 162643722121 is 121227346261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 87622512121 + 75021210000 = 296011^2 + 273900^2 .

It is a cyclic number.

It is not a de Polignac number, because 162643722121 - 2³ = 162643722113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162643722127) 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, 856386 + ... + 1028923.

It is an arithmetic number, because the mean of its divisors is an integer number (40661423425).

Almost surely, 2^162643722121 is an apocalyptic number.

It is an amenable number.

162643722121 is a deficient number, since it is larger than the sum of its proper divisors (1971579).

162643722121 is an equidigital number, since it uses as much as digits as its factorization.

162643722121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971578.

The product of its digits is 48384, while the sum is 37.

The spelling of 162643722121 in words is "one hundred sixty-two billion, six hundred forty-three million, seven hundred twenty-two thousand, one hundred twenty-one".