8148764581 has 4 divisors (see below), whose sum is σ = 8628103692. Its totient is φ = 7669425472.

The previous prime is 8148764551. The next prime is 8148764587. The reversal of 8148764581 is 1854678418.

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 6554359681 + 1594404900 = 80959^2 + 39930^2 .

It is a cyclic number.

It is not a de Polignac number, because 8148764581 - 2⁷ = 8148764453 is a prime.

It is a super-2 number, since 2×8148764581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8148764587) 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, 239669530 + ... + 239669563.

It is an arithmetic number, because the mean of its divisors is an integer number (2157025923).

Almost surely, 2^8148764581 is an apocalyptic number.

It is an amenable number.

8148764581 is a deficient number, since it is larger than the sum of its proper divisors (479339111).

8148764581 is a wasteful number, since it uses less digits than its factorization.

8148764581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479339110.

The product of its digits is 1720320, while the sum is 52.

The square root of 8148764581 is about 90270.5078140142. The cubic root of 8148764581 is about 2012.3209891622.

The spelling of 8148764581 in words is "eight billion, one hundred forty-eight million, seven hundred sixty-four thousand, five hundred eighty-one".