8157800641 has 4 divisors (see below), whose sum is σ = 8204955732. Its totient is φ = 8110645552.

The previous prime is 8157800593. The next prime is 8157800647. The reversal of 8157800641 is 1460087518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4716805041 + 3440995600 = 68679^2 + 58660^2 .

It is a cyclic number.

It is not a de Polignac number, because 8157800641 - 2¹⁹ = 8157276353 is a prime.

It is a super-2 number, since 2×8157800641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8157800594 and 8157800603.

It is not an unprimeable number, because it can be changed into a prime (8157800647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23577286 + ... + 23577631.

It is an arithmetic number, because the mean of its divisors is an integer number (2051238933).

Almost surely, 2^8157800641 is an apocalyptic number.

It is an amenable number.

8157800641 is a deficient number, since it is larger than the sum of its proper divisors (47155091).

8157800641 is a wasteful number, since it uses less digits than its factorization.

8157800641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47155090.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 8157800641 is about 90320.5438480084. The cubic root of 8157800641 is about 2013.0645266650.

The spelling of 8157800641 in words is "eight billion, one hundred fifty-seven million, eight hundred thousand, six hundred forty-one".