20350551251 has 2 divisors, whose sum is σ = 20350551252. Its totient is φ = 20350551250.

The previous prime is 20350551229. The next prime is 20350551253. The reversal of 20350551251 is 15215505302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20350551251 is a prime.

It is a Sophie Germain prime.

Together with 20350551253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20350551253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175275625 + 10175275626.

It is an arithmetic number, because the mean of its divisors is an integer number (10175275626).

Almost surely, 2^20350551251 is an apocalyptic number.

20350551251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350551251 is an equidigital number, since it uses as much as digits as its factorization.

20350551251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 20350551251 in words is "twenty billion, three hundred fifty million, five hundred fifty-one thousand, two hundred fifty-one".