20187552851 has 2 divisors, whose sum is σ = 20187552852. Its totient is φ = 20187552850.

The previous prime is 20187552841. The next prime is 20187552883. The reversal of 20187552851 is 15825578102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20187552851 is a prime.

It is a super-2 number, since 2×20187552851² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20187552841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10093776425 + 10093776426.

It is an arithmetic number, because the mean of its divisors is an integer number (10093776426).

Almost surely, 2^20187552851 is an apocalyptic number.

20187552851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20187552851 is an equidigital number, since it uses as much as digits as its factorization.

20187552851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224000, while the sum is 44.

The spelling of 20187552851 in words is "twenty billion, one hundred eighty-seven million, five hundred fifty-two thousand, eight hundred fifty-one".