7557649549 has 4 divisors (see below), whose sum is σ = 7558581760. Its totient is φ = 7556717340.

The previous prime is 7557649543. The next prime is 7557649559. The reversal of 7557649549 is 9459467557.

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: 9459467557 = 8663 ⋅1091939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7557649549 is a prime.

It is a super-3 number, since 3×7557649549³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7557649543) 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, 453837 + ... + 470194.

It is an arithmetic number, because the mean of its divisors is an integer number (1889645440).

Almost surely, 2^7557649549 is an apocalyptic number.

It is an amenable number.

7557649549 is a deficient number, since it is larger than the sum of its proper divisors (932211).

7557649549 is an equidigital number, since it uses as much as digits as its factorization.

7557649549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932210.

The product of its digits is 47628000, while the sum is 61.

The square root of 7557649549 is about 86934.7430490250. The cubic root of 7557649549 is about 1962.4363660598.

The spelling of 7557649549 in words is "seven billion, five hundred fifty-seven million, six hundred forty-nine thousand, five hundred forty-nine".