9999904651 has 4 divisors (see below), whose sum is σ = 10908986904. Its totient is φ = 9090822400.

The previous prime is 9999904637. The next prime is 9999904661. The reversal of 9999904651 is 1564099999.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9999904651 - 2⁹ = 9999904139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9999904651.

It is not an unprimeable number, because it can be changed into a prime (9999904661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454541110 + ... + 454541131.

It is an arithmetic number, because the mean of its divisors is an integer number (2727246726).

Almost surely, 2^9999904651 is an apocalyptic number.

9999904651 is a deficient number, since it is larger than the sum of its proper divisors (909082253).

9999904651 is a wasteful number, since it uses less digits than its factorization.

9999904651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909082252.

The product of its (nonzero) digits is 7085880, while the sum is 61.

The square root of 9999904651 is about 99999.5232538636. The cubic root of 9999904651 is about 2154.4278425703.

The spelling of 9999904651 in words is "nine billion, nine hundred ninety-nine million, nine hundred four thousand, six hundred fifty-one".