7930643865 has 16 divisors (see below), whose sum is σ = 12713304768. Its totient is φ = 4221585216.

The previous prime is 7930643843. The next prime is 7930643879. The reversal of 7930643865 is 5683460397.

It is not a de Polignac number, because 7930643865 - 2¹⁶ = 7930578329 is a prime.

It is a super-2 number, since 2×7930643865² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497614 + ... + 513303.

It is an arithmetic number, because the mean of its divisors is an integer number (794581548).

Almost surely, 2^7930643865 is an apocalyptic number.

It is an amenable number.

7930643865 is a deficient number, since it is larger than the sum of its proper divisors (4782660903).

7930643865 is a wasteful number, since it uses less digits than its factorization.

7930643865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011448.

The product of its (nonzero) digits is 3265920, while the sum is 51.

The square root of 7930643865 is about 89054.1625360657. The cubic root of 7930643865 is about 1994.2035388319.

The spelling of 7930643865 in words is "seven billion, nine hundred thirty million, six hundred forty-three thousand, eight hundred sixty-five".