2188668639551 has 2 divisors, whose sum is σ = 2188668639552. Its totient is φ = 2188668639550.

The previous prime is 2188668639539. The next prime is 2188668639617. The reversal of 2188668639551 is 1559368668812.

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-2188668639551 is a prime.

It is a super-2 number, since 2×2188668639551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2188668639851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094334319775 + 1094334319776.

It is an arithmetic number, because the mean of its divisors is an integer number (1094334319776).

Almost surely, 2^{2188668639551} is an apocalyptic number.

2188668639551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188668639551 is an equidigital number, since it uses as much as digits as its factorization.

2188668639551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 149299200, while the sum is 68.

The spelling of 2188668639551 in words is "two trillion, one hundred eighty-eight billion, six hundred sixty-eight million, six hundred thirty-nine thousand, five hundred fifty-one".