20051006251 has 2 divisors, whose sum is σ = 20051006252. Its totient is φ = 20051006250.

The previous prime is 20051006249. The next prime is 20051006291. The reversal of 20051006251 is 15260015002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20051006251 - 2¹ = 20051006249 is a prime.

Together with 20051006249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20051006231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025503125 + 10025503126.

It is an arithmetic number, because the mean of its divisors is an integer number (10025503126).

Almost surely, 2^20051006251 is an apocalyptic number.

20051006251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051006251 is an equidigital number, since it uses as much as digits as its factorization.

20051006251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 20051006251 in words is "twenty billion, fifty-one million, six thousand, two hundred fifty-one".