9961645374 has 24 divisors (see below), whose sum is σ = 21585472272. Its totient is φ = 3320255040.

The previous prime is 9961645349. The next prime is 9961645381. The reversal of 9961645374 is 4735461699.

9961645374 is a `hidden beast` number, since 9 + 96 + 16 + 4 + 537 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 9961645374.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304534 + ... + 335654.

It is an arithmetic number, because the mean of its divisors is an integer number (899394678).

Almost surely, 2^9961645374 is an apocalyptic number.

9961645374 is an abundant number, since it is smaller than the sum of its proper divisors (11623826898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9961645374 is a wasteful number, since it uses less digits than its factorization.

9961645374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48912 (or 48909 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 9961645374 is about 99808.0426318441. The cubic root of 9961645374 is about 2151.6767431275.

The spelling of 9961645374 in words is "nine billion, nine hundred sixty-one million, six hundred forty-five thousand, three hundred seventy-four".