6540061281 has 16 divisors (see below), whose sum is σ = 9644666304. Its totient is φ = 3915877824.

The previous prime is 6540061189. The next prime is 6540061291. The reversal of 6540061281 is 1821600456.

It is not a de Polignac number, because 6540061281 - 2¹⁰ = 6540060257 is a prime.

It is a super-2 number, since 2×6540061281² = 85544803118470721922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6540061291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2264691 + ... + 2267576.

It is an arithmetic number, because the mean of its divisors is an integer number (602791644).

Almost surely, 2^6540061281 is an apocalyptic number.

It is an amenable number.

6540061281 is a deficient number, since it is larger than the sum of its proper divisors (3104605023).

6540061281 is a wasteful number, since it uses less digits than its factorization.

6540061281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532320.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 6540061281 is about 80870.6453603531. The cubic root of 6540061281 is about 1870.0818099319.

The spelling of 6540061281 in words is "six billion, five hundred forty million, sixty-one thousand, two hundred eighty-one".