9661129858 has 8 divisors (see below), whose sum is σ = 14729263740. Its totient is φ = 4751375280.

The previous prime is 9661129837. The next prime is 9661129867. The reversal of 9661129858 is 8589211669.

It can be written as a sum of positive squares in 2 ways, for example, as 8787750049 + 873379809 = 93743^2 + 29553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9661129799 and 9661129808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39594673 + ... + 39594916.

Almost surely, 2^9661129858 is an apocalyptic number.

9661129858 is a deficient number, since it is larger than the sum of its proper divisors (5068133882).

9661129858 is a wasteful number, since it uses less digits than its factorization.

9661129858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79189652.

The product of its digits is 1866240, while the sum is 55.

The square root of 9661129858 is about 98291.0466827981. The cubic root of 9661129858 is about 2129.8187196848.

The spelling of 9661129858 in words is "nine billion, six hundred sixty-one million, one hundred twenty-nine thousand, eight hundred fifty-eight".