9953621165 has 8 divisors (see below), whose sum is σ = 11945869848. Its totient is φ = 7961880640.

The previous prime is 9953621129. The next prime is 9953621173. The reversal of 9953621165 is 5611263599.

It can be written as a sum of positive squares in 4 ways, for example, as 2645764969 + 7307856196 = 51437^2 + 85486^2 .

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

It is not a de Polignac number, because 9953621165 - 2⁶ = 9953621101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82526 + ... + 163455.

It is an arithmetic number, because the mean of its divisors is an integer number (1493233731).

Almost surely, 2^9953621165 is an apocalyptic number.

It is an amenable number.

9953621165 is a deficient number, since it is larger than the sum of its proper divisors (1992248683).

9953621165 is a wasteful number, since it uses less digits than its factorization.

9953621165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254079.

The product of its digits is 437400, while the sum is 47.

The square root of 9953621165 is about 99767.8363251404. The cubic root of 9953621165 is about 2151.0988552665.

The spelling of 9953621165 in words is "nine billion, nine hundred fifty-three million, six hundred twenty-one thousand, one hundred sixty-five".