7957919645 has 8 divisors (see below), whose sum is σ = 10284080856. Its totient is φ = 5876617536.

The previous prime is 7957919621. The next prime is 7957919647. The reversal of 7957919645 is 5469197597.

It can be written as a sum of positive squares in 4 ways, for example, as 135932281 + 7821987364 = 11659^2 + 88442^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7957919645 - 2¹⁰ = 7957918621 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 (7957919647) 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 7 ways as a sum of consecutive naturals, for example, 61214702 + ... + 61214831.

It is an arithmetic number, because the mean of its divisors is an integer number (1285510107).

Almost surely, 2^7957919645 is an apocalyptic number.

It is an amenable number.

7957919645 is a deficient number, since it is larger than the sum of its proper divisors (2326161211).

7957919645 is a wasteful number, since it uses less digits than its factorization.

7957919645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122429551.

The product of its digits is 21432600, while the sum is 62.

The square root of 7957919645 is about 89207.1726096058. The cubic root of 7957919645 is about 1996.4871372601.

The spelling of 7957919645 in words is "seven billion, nine hundred fifty-seven million, nine hundred nineteen thousand, six hundred forty-five".