7499168648521 has 27 divisors (see below), whose sum is σ = 8327138098503. Its totient is φ = 6748444211520.

The previous prime is 7499168648453. The next prime is 7499168648551. The reversal of 7499168648521 is 1258468619947.

The square root of 7499168648521 is 2738461.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7301911862025 + 197256786496 = 2702205^2 + 444136^2 .

It is not a de Polignac number, because 7499168648521 - 2³⁷ = 7361729695049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7499168648551) 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 26 ways as a sum of consecutive naturals, for example, 3102675105 + ... + 3102677521.

Almost surely, 2^{7499168648521} is an apocalyptic number.

7499168648521 is the 2738461-st square number.

7499168648521 is the 1369231-st centered octagonal number.

It is an amenable number.

7499168648521 is a deficient number, since it is larger than the sum of its proper divisors (827969449982).

7499168648521 is an frugal number, since it uses more digits than its factorization.

7499168648521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062 (or 2531 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 70.

The spelling of 7499168648521 in words is "seven trillion, four hundred ninety-nine billion, one hundred sixty-eight million, six hundred forty-eight thousand, five hundred twenty-one".