9719956765 has 4 divisors (see below), whose sum is σ = 11663948124. Its totient is φ = 7775965408.

The previous prime is 9719956739. The next prime is 9719956793. The reversal of 9719956765 is 5676599179.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5676599179 = 239 ⋅23751461.

It can be written as a sum of positive squares in 2 ways, for example, as 1071514756 + 8648442009 = 32734^2 + 92997^2 .

It is a cyclic number.

It is not a de Polignac number, because 9719956765 - 2⁷ = 9719956637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9719956697 and 9719956706.

It is a congruent number.

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, 971995672 + ... + 971995681.

It is an arithmetic number, because the mean of its divisors is an integer number (2915987031).

Almost surely, 2^9719956765 is an apocalyptic number.

It is an amenable number.

9719956765 is a deficient number, since it is larger than the sum of its proper divisors (1943991359).

9719956765 is a wasteful number, since it uses less digits than its factorization.

9719956765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943991358.

The product of its digits is 32148900, while the sum is 64.

The square root of 9719956765 is about 98589.8410841604. The cubic root of 9719956765 is about 2134.1328184449.

The spelling of 9719956765 in words is "nine billion, seven hundred nineteen million, nine hundred fifty-six thousand, seven hundred sixty-five".