9961645373 has 4 divisors (see below), whose sum is σ = 10130486880. Its totient is φ = 9792803868.

The previous prime is 9961645349. The next prime is 9961645381. The reversal of 9961645373 is 3735461699.

9961645373 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9961645373 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 (9961645313) 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, 84420665 + ... + 84420782.

It is an arithmetic number, because the mean of its divisors is an integer number (2532621720).

Almost surely, 2^9961645373 is an apocalyptic number.

It is an amenable number.

9961645373 is a deficient number, since it is larger than the sum of its proper divisors (168841507).

9961645373 is a wasteful number, since it uses less digits than its factorization.

9961645373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168841506.

The product of its digits is 3674160, while the sum is 53.

The square root of 9961645373 is about 99808.0426268344. The cubic root of 9961645373 is about 2151.6767430555.

The spelling of 9961645373 in words is "nine billion, nine hundred sixty-one million, six hundred forty-five thousand, three hundred seventy-three".