7939665641 has 16 divisors (see below), whose sum is σ = 8589451200. Its totient is φ = 7314608448.

The previous prime is 7939665637. The next prime is 7939665647. The reversal of 7939665641 is 1465669397.

It is not a de Polignac number, because 7939665641 - 2² = 7939665637 is a prime.

It is a super-3 number, since 3×7939665641³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7939665647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165875 + ... + 208311.

It is an arithmetic number, because the mean of its divisors is an integer number (536840700).

Almost surely, 2^7939665641 is an apocalyptic number.

It is an amenable number.

7939665641 is a deficient number, since it is larger than the sum of its proper divisors (649785559).

7939665641 is a wasteful number, since it uses less digits than its factorization.

7939665641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42728.

The product of its digits is 7348320, while the sum is 56.

The square root of 7939665641 is about 89104.8014475090. The cubic root of 7939665641 is about 1994.9594438189.

The spelling of 7939665641 in words is "seven billion, nine hundred thirty-nine million, six hundred sixty-five thousand, six hundred forty-one".