9778248651 has 4 divisors (see below), whose sum is σ = 13037664872. Its totient is φ = 6518832432.

The previous prime is 9778248619. The next prime is 9778248679. The reversal of 9778248651 is 1568428779.

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

It is not a de Polignac number, because 9778248651 - 2⁵ = 9778248619 is a prime.

It is a super-2 number, since 2×9778248651² (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 = 9778248591 and 9778248600.

It is not an unprimeable number, because it can be changed into a prime (9778248691) 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, 1629708106 + ... + 1629708111.

It is an arithmetic number, because the mean of its divisors is an integer number (3259416218).

Almost surely, 2^9778248651 is an apocalyptic number.

9778248651 is a deficient number, since it is larger than the sum of its proper divisors (3259416221).

9778248651 is a wasteful number, since it uses less digits than its factorization.

9778248651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259416220.

The product of its digits is 6773760, while the sum is 57.

The square root of 9778248651 is about 98885.0274359066. The cubic root of 9778248651 is about 2138.3905454013.

The spelling of 9778248651 in words is "nine billion, seven hundred seventy-eight million, two hundred forty-eight thousand, six hundred fifty-one".