9978609651 has 8 divisors (see below), whose sum is σ = 13305961104. Its totient is φ = 6651832320.

The previous prime is 9978609649. The next prime is 9978609671. The reversal of 9978609651 is 1569068799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9978609651 - 2¹ = 9978609649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9978609631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101190 + ... + 173771.

It is an arithmetic number, because the mean of its divisors is an integer number (1663245138).

Almost surely, 2^9978609651 is an apocalyptic number.

9978609651 is a deficient number, since it is larger than the sum of its proper divisors (3327351453).

9978609651 is a wasteful number, since it uses less digits than its factorization.

9978609651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287061.

The product of its (nonzero) digits is 7348320, while the sum is 60.

The square root of 9978609651 is about 99892.9910003700. The cubic root of 9978609651 is about 2152.8974564476.

The spelling of 9978609651 in words is "nine billion, nine hundred seventy-eight million, six hundred nine thousand, six hundred fifty-one".