9979630649 has 16 divisors (see below), whose sum is σ = 10805529600. Its totient is φ = 9180793344.

The previous prime is 9979630643. The next prime is 9979630651. The reversal of 9979630649 is 9460369799.

It is a cyclic number.

It is not a de Polignac number, because 9979630649 - 2⁸ = 9979630393 is a prime.

It is a super-2 number, since 2×9979630649² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9979630591 and 9979630600.

It is not an unprimeable number, because it can be changed into a prime (9979630643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638672 + ... + 654110.

It is an arithmetic number, because the mean of its divisors is an integer number (675345600).

Almost surely, 2^9979630649 is an apocalyptic number.

It is an amenable number.

9979630649 is a deficient number, since it is larger than the sum of its proper divisors (825898951).

9979630649 is a wasteful number, since it uses less digits than its factorization.

9979630649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16312.

The product of its (nonzero) digits is 19840464, while the sum is 62.

The square root of 9979630649 is about 99898.1013283035. The cubic root of 9979630649 is about 2152.9708811400.

The spelling of 9979630649 in words is "nine billion, nine hundred seventy-nine million, six hundred thirty thousand, six hundred forty-nine".