5508757507721 has 4 divisors (see below), whose sum is σ = 5932508085252. Its totient is φ = 5085006930192.

The previous prime is 5508757507679. The next prime is 5508757507741. The reversal of 5508757507721 is 1277057578055.

It is a happy number.

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 1584416317696 + 3924341190025 = 1258736^2 + 1980995^2 .

It is a cyclic number.

It is not a de Polignac number, because 5508757507721 - 2¹⁴ = 5508757491337 is a prime.

It is a super-2 number, since 2×5508757507721² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5508757507741) 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, 211875288746 + ... + 211875288771.

It is an arithmetic number, because the mean of its divisors is an integer number (1483127021313).

Almost surely, 2^{5508757507721} is an apocalyptic number.

It is an amenable number.

5508757507721 is a deficient number, since it is larger than the sum of its proper divisors (423750577531).

5508757507721 is a wasteful number, since it uses less digits than its factorization.

5508757507721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423750577530.

The product of its (nonzero) digits is 24010000, while the sum is 59.

The spelling of 5508757507721 in words is "five trillion, five hundred eight billion, seven hundred fifty-seven million, five hundred seven thousand, seven hundred twenty-one".