6540442553 has 8 divisors (see below), whose sum is σ = 6572996040. Its totient is φ = 6507970560.

The previous prime is 6540442543. The next prime is 6540442607. The reversal of 6540442553 is 3552440456.

It can be written as a sum of positive squares in 4 ways, for example, as 54878464 + 6485564089 = 7408^2 + 80533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6540442553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6540442543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143801 + ... + 183737.

It is an arithmetic number, because the mean of its divisors is an integer number (821624505).

Almost surely, 2^6540442553 is an apocalyptic number.

It is an amenable number.

6540442553 is a deficient number, since it is larger than the sum of its proper divisors (32553487).

6540442553 is a wasteful number, since it uses less digits than its factorization.

6540442553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40747.

The product of its (nonzero) digits is 288000, while the sum is 38.

The square root of 6540442553 is about 80873.0026213940. The cubic root of 6540442553 is about 1870.1181498552.

The spelling of 6540442553 in words is "six billion, five hundred forty million, four hundred forty-two thousand, five hundred fifty-three".