9988877766651 has 36 divisors (see below), whose sum is σ = 16045615298232. Its totient is φ = 5511104906496.

The previous prime is 9988877766631. The next prime is 9988877766661. The reversal of 9988877766651 is 1566677788899.

It is a happy number.

It is not a de Polignac number, because 9988877766651 - 2⁷ = 9988877766523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (87).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9988877766631) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40275630 + ... + 40522883.

It is an arithmetic number, because the mean of its divisors is an integer number (445711536062).

Almost surely, 2^{9988877766651} is an apocalyptic number.

9988877766651 is a deficient number, since it is larger than the sum of its proper divisors (6056737531581).

9988877766651 is a wasteful number, since it uses less digits than its factorization.

9988877766651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80798588 (or 80798552 counting only the distinct ones).

The product of its digits is 15362887680, while the sum is 87.

The spelling of 9988877766651 in words is "nine trillion, nine hundred eighty-eight billion, eight hundred seventy-seven million, seven hundred sixty-six thousand, six hundred fifty-one".