122501564561 has 8 divisors (see below), whose sum is σ = 123024087144. Its totient is φ = 121979752960.

The previous prime is 122501564531. The next prime is 122501564567. The reversal of 122501564561 is 165465105221.

It can be written as a sum of positive squares in 4 ways, for example, as 74048750161 + 48452814400 = 272119^2 + 220120^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122501564561 is a prime.

It is a super-2 number, since 2×122501564561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122501564567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169025 + ... + 523041.

It is an arithmetic number, because the mean of its divisors is an integer number (15378010893).

Almost surely, 2^122501564561 is an apocalyptic number.

It is an amenable number.

122501564561 is a deficient number, since it is larger than the sum of its proper divisors (522522583).

122501564561 is a wasteful number, since it uses less digits than its factorization.

122501564561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355491.

The product of its (nonzero) digits is 72000, while the sum is 38.

Adding to 122501564561 its reverse (165465105221), we get a palindrome (287966669782).

The spelling of 122501564561 in words is "one hundred twenty-two billion, five hundred one million, five hundred sixty-four thousand, five hundred sixty-one".