7543646507849 has 4 divisors (see below), whose sum is σ = 7545826126020. Its totient is φ = 7541466889680.

The previous prime is 7543646507753. The next prime is 7543646507861. The reversal of 7543646507849 is 9487056463457.

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 621259240000 + 6922387267849 = 788200^2 + 2631043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7543646507849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7543646507249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089803894 + ... + 1089810815.

It is an arithmetic number, because the mean of its divisors is an integer number (1886456531505).

Almost surely, 2^{7543646507849} is an apocalyptic number.

It is an amenable number.

7543646507849 is a deficient number, since it is larger than the sum of its proper divisors (2179618171).

7543646507849 is a wasteful number, since it uses less digits than its factorization.

7543646507849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179618170.

The product of its (nonzero) digits is 609638400, while the sum is 68.

The spelling of 7543646507849 in words is "seven trillion, five hundred forty-three billion, six hundred forty-six million, five hundred seven thousand, eight hundred forty-nine".