999998888866651 has 2 divisors, whose sum is σ = 999998888866652. Its totient is φ = 999998888866650.

The previous prime is 999998888866603. The next prime is 999998888866741. The reversal of 999998888866651 is 156668888899999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999998888866651 - 2⁴¹ = 997799865611099 is a prime.

It is a super-4 number, since 4×999998888866651⁴ (a number of 61 digits) contains 4444 as substring.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999998888866451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999444433325 + 499999444433326.

It is an arithmetic number, because the mean of its divisors is an integer number (499999444433326).

Almost surely, 2^{999998888866651} is an apocalyptic number.

999998888866651 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998888866651 is an equidigital number, since it uses as much as digits as its factorization.

999998888866651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2089711042560, while the sum is 109.

The spelling of 999998888866651 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, eight hundred eighty-eight million, eight hundred sixty-six thousand, six hundred fifty-one".