6540749696249 has 4 divisors (see below), whose sum is σ = 6541207329636. Its totient is φ = 6540292062864.

The previous prime is 6540749696167. The next prime is 6540749696263. The reversal of 6540749696249 is 9426969470456.

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 586939854400 + 5953809841849 = 766120^2 + 2440043^2 .

It is a cyclic number.

It is not a de Polignac number, because 6540749696249 - 2²⁴ = 6540732919033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6540749690249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228795254 + ... + 228823839.

It is an arithmetic number, because the mean of its divisors is an integer number (1635301832409).

Almost surely, 2^{6540749696249} is an apocalyptic number.

It is an amenable number.

6540749696249 is a deficient number, since it is larger than the sum of its proper divisors (457633387).

6540749696249 is a wasteful number, since it uses less digits than its factorization.

6540749696249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457633386.

The product of its (nonzero) digits is 705438720, while the sum is 71.

The spelling of 6540749696249 in words is "six trillion, five hundred forty billion, seven hundred forty-nine million, six hundred ninety-six thousand, two hundred forty-nine".