122271865861 has 4 divisors (see below), whose sum is σ = 124578882252. Its totient is φ = 119964849472.

The previous prime is 122271865853. The next prime is 122271865889. The reversal of 122271865861 is 168568172221.

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 99442469025 + 22829396836 = 315345^2 + 151094^2 .

It is a cyclic number.

It is not a de Polignac number, because 122271865861 - 2³ = 122271865853 is a prime.

It is a super-2 number, since 2×122271865861² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122271865841) 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, 1153508116 + ... + 1153508221.

It is an arithmetic number, because the mean of its divisors is an integer number (31144720563).

Almost surely, 2^122271865861 is an apocalyptic number.

It is an amenable number.

122271865861 is a deficient number, since it is larger than the sum of its proper divisors (2307016391).

122271865861 is an equidigital number, since it uses as much as digits as its factorization.

122271865861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307016390.

The product of its digits is 645120, while the sum is 49.

The spelling of 122271865861 in words is "one hundred twenty-two billion, two hundred seventy-one million, eight hundred sixty-five thousand, eight hundred sixty-one".