20511611555122 has 8 divisors (see below), whose sum is σ = 31072045227372. Its totient is φ = 10154263146000.

The previous prime is 20511611555117. The next prime is 20511611555147. The reversal of 20511611555122 is 22155511611502.

It can be written as a sum of positive squares in 2 ways, for example, as 16420170856761 + 4091440698361 = 4052181^2 + 2022731^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50771315529 + ... + 50771315932.

Almost surely, 2^{20511611555122} is an apocalyptic number.

20511611555122 is a deficient number, since it is larger than the sum of its proper divisors (10560433672250).

20511611555122 is a wasteful number, since it uses less digits than its factorization.

20511611555122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101542631564.

The product of its (nonzero) digits is 30000, while the sum is 37.

The spelling of 20511611555122 in words is "twenty trillion, five hundred eleven billion, six hundred eleven million, five hundred fifty-five thousand, one hundred twenty-two".