6540442506 has 48 divisors (see below), whose sum is σ = 15269927400. Its totient is φ = 2011271040.

The previous prime is 6540442483. The next prime is 6540442543. The reversal of 6540442506 is 6052440456.

It can be written as a sum of positive squares in 4 ways, for example, as 3491746281 + 3048696225 = 59091^2 + 55215^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 448896 + ... + 463236.

Almost surely, 2^6540442506 is an apocalyptic number.

6540442506 is an abundant number, since it is smaller than the sum of its proper divisors (8729484894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6540442506 is a wasteful number, since it uses less digits than its factorization.

6540442506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16311 (or 16308 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 6540442506 is about 80873.0023308149. The cubic root of 6540442506 is about 1870.1181453756.

The spelling of 6540442506 in words is "six billion, five hundred forty million, four hundred forty-two thousand, five hundred six".