20111201651 has 2 divisors, whose sum is σ = 20111201652. Its totient is φ = 20111201650.

The previous prime is 20111201647. The next prime is 20111201657. The reversal of 20111201651 is 15610211102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111201651 - 2² = 20111201647 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20111201657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055600825 + 10055600826.

It is an arithmetic number, because the mean of its divisors is an integer number (10055600826).

Almost surely, 2^20111201651 is an apocalyptic number.

20111201651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111201651 is an equidigital number, since it uses as much as digits as its factorization.

20111201651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 20111201651 its reverse (15610211102), we get a palindrome (35721412753).

The spelling of 20111201651 in words is "twenty billion, one hundred eleven million, two hundred one thousand, six hundred fifty-one".