20416542885251 has 2 divisors, whose sum is σ = 20416542885252. Its totient is φ = 20416542885250.

The previous prime is 20416542885247. The next prime is 20416542885257. The reversal of 20416542885251 is 15258824561402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20416542885251 - 2² = 20416542885247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20416542885193 and 20416542885202.

It is not a weakly prime, because it can be changed into another prime (20416542885257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208271442625 + 10208271442626.

It is an arithmetic number, because the mean of its divisors is an integer number (10208271442626).

Almost surely, 2^{20416542885251} is an apocalyptic number.

20416542885251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416542885251 is an equidigital number, since it uses as much as digits as its factorization.

20416542885251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144000, while the sum is 53.

The spelling of 20416542885251 in words is "twenty trillion, four hundred sixteen billion, five hundred forty-two million, eight hundred eighty-five thousand, two hundred fifty-one".