7091808672025 has 81 divisors (see below), whose sum is σ = 11245701014877. Its totient is φ = 4420228612800.

The previous prime is 7091808672001. The next prime is 7091808672041. The reversal of 7091808672025 is 5202768081907.

The square root of 7091808672025 is 2663045.

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

It can be written as a sum of positive squares in 4 ways, for example, as 410103001 + 7091398569024 = 20251^2 + 2662968^2 .

It is not a de Polignac number, because 7091808672025 - 2⁹ = 7091808671513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1025268867 + ... + 1025275783.

Almost surely, 2^{7091808672025} is an apocalyptic number.

7091808672025 is the 2663045-th square number.

7091808672025 is the 1331523-rd centered octagonal number.

It is an amenable number.

7091808672025 is a deficient number, since it is larger than the sum of its proper divisors (4153892342852).

7091808672025 is an frugal number, since it uses more digits than its factorization.

7091808672025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880 (or 6940 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 7091808672025 in words is "seven trillion, ninety-one billion, eight hundred eight million, six hundred seventy-two thousand, twenty-five".