9661810645067 has 24 divisors (see below), whose sum is σ = 11936334573360. Its totient is φ = 7770853601280.

The previous prime is 9661810645057. The next prime is 9661810645087. The reversal of 9661810645067 is 7605460181669.

It is not a de Polignac number, because 9661810645067 - 2²⁸ = 9661542209611 is a prime.

It is a super-2 number, since 2×9661810645067² (a number of 27 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 = 9661810644997 and 9661810645015.

It is not an unprimeable number, because it can be changed into a prime (9661810645007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17245142 + ... + 17796587.

It is an arithmetic number, because the mean of its divisors is an integer number (497347273890).

Almost surely, 2^{9661810645067} is an apocalyptic number.

9661810645067 is a deficient number, since it is larger than the sum of its proper divisors (2274523928293).

9661810645067 is a wasteful number, since it uses less digits than its factorization.

9661810645067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35042091 (or 35042084 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 9661810645067 in words is "nine trillion, six hundred sixty-one billion, eight hundred ten million, six hundred forty-five thousand, sixty-seven".