20136501251 has 2 divisors, whose sum is σ = 20136501252. Its totient is φ = 20136501250.

The previous prime is 20136501239. The next prime is 20136501269. The reversal of 20136501251 is 15210563102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20136501251 - 2¹⁸ = 20136239107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20136501251.

It is not a weakly prime, because it can be changed into another prime (20136501221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10068250625 + 10068250626.

It is an arithmetic number, because the mean of its divisors is an integer number (10068250626).

Almost surely, 2^20136501251 is an apocalyptic number.

20136501251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20136501251 is an equidigital number, since it uses as much as digits as its factorization.

20136501251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 20136501251 in words is "twenty billion, one hundred thirty-six million, five hundred one thousand, two hundred fifty-one".