9999886651 has 2 divisors, whose sum is σ = 9999886652. Its totient is φ = 9999886650.

The previous prime is 9999886639. The next prime is 9999886657. The reversal of 9999886651 is 1566889999.

It is a strong prime.

It is an emirp because it is prime and its reverse (1566889999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9999886651 - 2⁵ = 9999886619 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9999886657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999943325 + 4999943326.

It is an arithmetic number, because the mean of its divisors is an integer number (4999943326).

Almost surely, 2^9999886651 is an apocalyptic number.

9999886651 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999886651 is an equidigital number, since it uses as much as digits as its factorization.

9999886651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75582720, while the sum is 70.

The square root of 9999886651 is about 99999.4332533940. The cubic root of 9999886651 is about 2154.4265499005.

The spelling of 9999886651 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-six thousand, six hundred fifty-one".