9947215653 has 4 divisors (see below), whose sum is σ = 13262954208. Its totient is φ = 6631477100.

The previous prime is 9947215643. The next prime is 9947215699. The reversal of 9947215653 is 3565127499.

9947215653 is digitally balanced in base 2, 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 not a de Polignac number, because 9947215653 - 2²⁴ = 9930438437 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9947215596 and 9947215605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947215643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657869273 + ... + 1657869278.

It is an arithmetic number, because the mean of its divisors is an integer number (3315738552).

Almost surely, 2^9947215653 is an apocalyptic number.

It is an amenable number.

9947215653 is a deficient number, since it is larger than the sum of its proper divisors (3315738555).

9947215653 is a wasteful number, since it uses less digits than its factorization.

9947215653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315738554.

The product of its digits is 2041200, while the sum is 51.

The square root of 9947215653 is about 99735.7290693761. The cubic root of 9947215653 is about 2150.6373198415.

The spelling of 9947215653 in words is "nine billion, nine hundred forty-seven million, two hundred fifteen thousand, six hundred fifty-three".