7991001770896 has 15 divisors (see below), whose sum is σ = 15482587839121. Its totient is φ = 3995495231776.

The previous prime is 7991001770881. The next prime is 7991001770911. The reversal of 7991001770896 is 6980771001997.

The square root of 7991001770896 is 2826836.

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

It is an interprime number because it is at equal distance from previous prime (7991001770881) and next prime (7991001770911).

It can be written as a sum of positive squares in only one way, i.e., 1122828452496 + 6868173318400 = 1059636^2 + 2620720^2 .

It is a super-2 number, since 2×7991001770896² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10953990 + ... + 11660698.

Almost surely, 2^{7991001770896} is an apocalyptic number.

7991001770896 is the 2826836-th square number.

It is an amenable number.

7991001770896 is a deficient number, since it is larger than the sum of its proper divisors (7491586068225).

7991001770896 is an frugal number, since it uses more digits than its factorization.

7991001770896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413426 (or 706711 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 64.

Multiplying 7991001770896 by its sum of digits (64), we get a square (511424113337344 = 22614688²).

The spelling of 7991001770896 in words is "seven trillion, nine hundred ninety-one billion, one million, seven hundred seventy thousand, eight hundred ninety-six".