7556638513 has 4 divisors (see below), whose sum is σ = 7559144560. Its totient is φ = 7554132468.

The previous prime is 7556638511. The next prime is 7556638519. The reversal of 7556638513 is 3158366557.

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: 3158366557 = 6217 ⋅508021.

It is a cyclic number.

It is not a de Polignac number, because 7556638513 - 2¹ = 7556638511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7556638511) 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, 1248495 + ... + 1254532.

It is an arithmetic number, because the mean of its divisors is an integer number (1889786140).

Almost surely, 2^7556638513 is an apocalyptic number.

It is an amenable number.

7556638513 is a deficient number, since it is larger than the sum of its proper divisors (2506047).

7556638513 is a wasteful number, since it uses less digits than its factorization.

7556638513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506046.

The product of its digits is 2268000, while the sum is 49.

The square root of 7556638513 is about 86928.9279411635. The cubic root of 7556638513 is about 1962.3488528596.

The spelling of 7556638513 in words is "seven billion, five hundred fifty-six million, six hundred thirty-eight thousand, five hundred thirteen".