20055818556251 has 2 divisors, whose sum is σ = 20055818556252. Its totient is φ = 20055818556250.

The previous prime is 20055818556239. The next prime is 20055818556331. The reversal of 20055818556251 is 15265581855002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20055818556251 is a prime.

It is a super-2 number, since 2×20055818556251² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20055818556193 and 20055818556202.

It is not a weakly prime, because it can be changed into another prime (20055818556211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10027909278125 + 10027909278126.

It is an arithmetic number, because the mean of its divisors is an integer number (10027909278126).

Almost surely, 2^{20055818556251} is an apocalyptic number.

20055818556251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20055818556251 is an equidigital number, since it uses as much as digits as its factorization.

20055818556251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800000, while the sum is 53.

The spelling of 20055818556251 in words is "twenty trillion, fifty-five billion, eight hundred eighteen million, five hundred fifty-six thousand, two hundred fifty-one".