7973812554436 has 9 divisors (see below), whose sum is σ = 13954181853549. Its totient is φ = 3986903453424.

The previous prime is 7973812554431. The next prime is 7973812554443. The reversal of 7973812554436 is 6344552183797.

The square root of 7973812554436 is 2823794.

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., 3924638344900 + 4049174209536 = 1981070^2 + 2012256^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7973812554431) 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 2 ways as a sum of consecutive naturals, for example, 4941640 + ... + 6353536.

Almost surely, 2^{7973812554436} is an apocalyptic number.

7973812554436 is the 2823794-th square number.

It is an amenable number.

7973812554436 is a deficient number, since it is larger than the sum of its proper divisors (5980369299113).

7973812554436 is an frugal number, since it uses more digits than its factorization.

7973812554436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823798 (or 1411899 counting only the distinct ones).

The product of its digits is 152409600, while the sum is 64.

Multiplying 7973812554436 by its sum of digits (64), we get a square (510324003483904 = 22590352²).

The spelling of 7973812554436 in words is "seven trillion, nine hundred seventy-three billion, eight hundred twelve million, five hundred fifty-four thousand, four hundred thirty-six".