7442196785521 has 27 divisors (see below), whose sum is σ = 7977210474681. Its totient is φ = 6942029931144.

The previous prime is 7442196785501. The next prime is 7442196785539. The reversal of 7442196785521 is 1255876912447.

The square root of 7442196785521 is 2728039.

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

It is not a de Polignac number, because 7442196785521 - 2¹⁷ = 7442196654449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7442196785521.

It is not an unprimeable number, because it can be changed into a prime (7442196785501) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3472792576 + ... + 3472794718.

It is an arithmetic number, because the mean of its divisors is an integer number (295452239803).

Almost surely, 2^{7442196785521} is an apocalyptic number.

7442196785521 is the 2728039-th square number.

7442196785521 is the 1364020-th centered octagonal number.

It is an amenable number.

7442196785521 is a deficient number, since it is larger than the sum of its proper divisors (535013689160).

7442196785521 is an frugal number, since it uses more digits than its factorization.

7442196785521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458 (or 2229 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 61.

The spelling of 7442196785521 in words is "seven trillion, four hundred forty-two billion, one hundred ninety-six million, seven hundred eighty-five thousand, five hundred twenty-one".