9778997461 has 12 divisors (see below), whose sum is σ = 10454564224. Its totient is φ = 9137192400.

The previous prime is 9778997443. The next prime is 9778997477. The reversal of 9778997461 is 1647998779.

It is a de Polignac number, because none of the positive numbers 2^k-9778997461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9778997401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161475 + ... + 213616.

Almost surely, 2^9778997461 is an apocalyptic number.

It is an amenable number.

9778997461 is a deficient number, since it is larger than the sum of its proper divisors (675566763).

9778997461 is a wasteful number, since it uses less digits than its factorization.

9778997461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375180 (or 375151 counting only the distinct ones).

The product of its digits is 48009024, while the sum is 67.

The square root of 9778997461 is about 98888.8136292473. The cubic root of 9778997461 is about 2138.4451293870.

The spelling of 9778997461 in words is "nine billion, seven hundred seventy-eight million, nine hundred ninety-seven thousand, four hundred sixty-one".