6542664605 has 4 divisors (see below), whose sum is σ = 7851197532. Its totient is φ = 5234131680.

The previous prime is 6542664599. The next prime is 6542664619. The reversal of 6542664605 is 5064662456.

It is a happy number.

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 2448072484 + 4094592121 = 49478^2 + 63989^2 .

It is not a de Polignac number, because 6542664605 - 2⁴ = 6542664589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654266456 + ... + 654266465.

It is an arithmetic number, because the mean of its divisors is an integer number (1962799383).

Almost surely, 2^6542664605 is an apocalyptic number.

It is an amenable number.

6542664605 is a deficient number, since it is larger than the sum of its proper divisors (1308532927).

6542664605 is a wasteful number, since it uses less digits than its factorization.

6542664605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308532926.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The square root of 6542664605 is about 80886.7393643729. The cubic root of 6542664605 is about 1870.3299107176.

It can be divided in two parts, 65426 and 64605, that added together give a palindrome (130031).

The spelling of 6542664605 in words is "six billion, five hundred forty-two million, six hundred sixty-four thousand, six hundred five".