651111111401 has 2 divisors, whose sum is σ = 651111111402. Its totient is φ = 651111111400.

The previous prime is 651111111383. The next prime is 651111111449. The reversal of 651111111401 is 104111111156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512913792400 + 138197319001 = 716180^2 + 371749^2 .

It is a cyclic number.

It is not a de Polignac number, because 651111111401 - 2¹⁴ = 651111095017 is a prime.

It is not a weakly prime, because it can be changed into another prime (651111111451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325555555700 + 325555555701.

It is an arithmetic number, because the mean of its divisors is an integer number (325555555701).

Almost surely, 2^651111111401 is an apocalyptic number.

It is an amenable number.

651111111401 is a deficient number, since it is larger than the sum of its proper divisors (1).

651111111401 is an equidigital number, since it uses as much as digits as its factorization.

651111111401 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 23.

Adding to 651111111401 its reverse (104111111156), we get a palindrome (755222222557).

The spelling of 651111111401 in words is "six hundred fifty-one billion, one hundred eleven million, one hundred eleven thousand, four hundred one".