9997949653 has 4 divisors (see below), whose sum is σ = 9999067948. Its totient is φ = 9996831360.

The previous prime is 9997949639. The next prime is 9997949677. The reversal of 9997949653 is 3569497999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3569497999 = 1949 ⋅1831451.

It can be written as a sum of positive squares in 2 ways, for example, as 7138053169 + 2859896484 = 84487^2 + 53478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997949653 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 (9997949453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545628 + ... + 563653.

It is an arithmetic number, because the mean of its divisors is an integer number (2499766987).

Almost surely, 2^9997949653 is an apocalyptic number.

It is an amenable number.

9997949653 is a deficient number, since it is larger than the sum of its proper divisors (1118295).

9997949653 is a wasteful number, since it uses less digits than its factorization.

9997949653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118294.

The product of its digits is 148803480, while the sum is 70.

The square root of 9997949653 is about 99989.7477394558. The cubic root of 9997949653 is about 2154.2874353439.

The spelling of 9997949653 in words is "nine billion, nine hundred ninety-seven million, nine hundred forty-nine thousand, six hundred fifty-three".