122611800261 has 4 divisors (see below), whose sum is σ = 163482400352. Its totient is φ = 81741200172.

The previous prime is 122611800257. The next prime is 122611800307. The reversal of 122611800261 is 162008116221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 122611800261 - 2² = 122611800257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122611800221) 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, 20435300041 + ... + 20435300046.

It is an arithmetic number, because the mean of its divisors is an integer number (40870600088).

Almost surely, 2^122611800261 is an apocalyptic number.

It is an amenable number.

122611800261 is a deficient number, since it is larger than the sum of its proper divisors (40870600091).

122611800261 is an equidigital number, since it uses as much as digits as its factorization.

122611800261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40870600090.

The product of its (nonzero) digits is 2304, while the sum is 30.

Adding to 122611800261 its reverse (162008116221), we get a palindrome (284619916482).

The spelling of 122611800261 in words is "one hundred twenty-two billion, six hundred eleven million, eight hundred thousand, two hundred sixty-one".