8638540511 has 4 divisors (see below), whose sum is σ = 8640393792. Its totient is φ = 8636687232.

The previous prime is 8638540499. The next prime is 8638540549. The reversal of 8638540511 is 1150458368.

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

It is a cyclic number.

It is not a de Polignac number, because 8638540511 - 2¹⁴ = 8638524127 is a prime.

It is a super-2 number, since 2×8638540511² (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 (8638570511) 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, 919631 + ... + 928976.

It is an arithmetic number, because the mean of its divisors is an integer number (2160098448).

Almost surely, 2^8638540511 is an apocalyptic number.

8638540511 is a deficient number, since it is larger than the sum of its proper divisors (1853281).

8638540511 is a wasteful number, since it uses less digits than its factorization.

8638540511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853280.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 8638540511 is about 92943.7491765853. The cubic root of 8638540511 is about 2051.8555882517.

Adding to 8638540511 its reverse (1150458368), we get a palindrome (9788998879).

The spelling of 8638540511 in words is "eight billion, six hundred thirty-eight million, five hundred forty thousand, five hundred eleven".