9961645376 has 14 divisors (see below), whose sum is σ = 19767640170. Its totient is φ = 4980822656.

The previous prime is 9961645349. The next prime is 9961645381. The reversal of 9961645376 is 6735461699.

It can be written as a sum of positive squares in only one way, i.e., 9249822976 + 711822400 = 96176^2 + 26680^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77825291 + ... + 77825418.

Almost surely, 2^9961645376 is an apocalyptic number.

It is an amenable number.

9961645376 is a deficient number, since it is larger than the sum of its proper divisors (9805994794).

9961645376 is a wasteful number, since it uses less digits than its factorization.

9961645376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155650721 (or 155650711 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 56.

The square root of 9961645376 is about 99808.0426418633. The cubic root of 9961645376 is about 2151.6767432715.

The spelling of 9961645376 in words is "nine billion, nine hundred sixty-one million, six hundred forty-five thousand, three hundred seventy-six".