7681253549 has 4 divisors (see below), whose sum is σ = 7724165760. Its totient is φ = 7638341340.

The previous prime is 7681253477. The next prime is 7681253551. The reversal of 7681253549 is 9453521867.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9453521867 = 37 ⋅255500591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7681253549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7681253497 and 7681253506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681253149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21455837 + ... + 21456194.

It is an arithmetic number, because the mean of its divisors is an integer number (1931041440).

Almost surely, 2^7681253549 is an apocalyptic number.

It is an amenable number.

7681253549 is a deficient number, since it is larger than the sum of its proper divisors (42912211).

7681253549 is a wasteful number, since it uses less digits than its factorization.

7681253549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42912210.

The product of its digits is 1814400, while the sum is 50.

The square root of 7681253549 is about 87642.7609617588. The cubic root of 7681253549 is about 1973.0769979884.

The spelling of 7681253549 in words is "seven billion, six hundred eighty-one million, two hundred fifty-three thousand, five hundred forty-nine".