6540400105 has 4 divisors (see below), whose sum is σ = 7848480132. Its totient is φ = 5232320080.

The previous prime is 6540400093. The next prime is 6540400117. The reversal of 6540400105 is 5010040456.

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

It is an interprime number because it is at equal distance from previous prime (6540400093) and next prime (6540400117).

It can be written as a sum of positive squares in 2 ways, for example, as 4864644009 + 1675756096 = 69747^2 + 40936^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6540400105 is a prime.

It is a super-2 number, since 2×6540400105² = 85553667066968022050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6540400105.

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, 654040006 + ... + 654040015.

It is an arithmetic number, because the mean of its divisors is an integer number (1962120033).

Almost surely, 2^6540400105 is an apocalyptic number.

It is an amenable number.

6540400105 is a deficient number, since it is larger than the sum of its proper divisors (1308080027).

6540400105 is a wasteful number, since it uses less digits than its factorization.

6540400105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308080026.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 6540400105 is about 80872.7401848113. The cubic root of 6540400105 is about 1870.1141041072.

The spelling of 6540400105 in words is "six billion, five hundred forty million, four hundred thousand, one hundred five".