7821081658725 has 48 divisors (see below), whose sum is σ = 13663181452800. Its totient is φ = 3936678736320.

The previous prime is 7821081658699. The next prime is 7821081658777. The reversal of 7821081658725 is 5278561801287.

It is a happy number.

It is not a de Polignac number, because 7821081658725 - 2⁵ = 7821081658693 is a prime.

It is a super-2 number, since 2×7821081658725² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10059595 + ... + 10809144.

It is an arithmetic number, because the mean of its divisors is an integer number (284649613600).

Almost surely, 2^{7821081658725} is an apocalyptic number.

7821081658725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7821081658725 is a deficient number, since it is larger than the sum of its proper divisors (5842099794075).

7821081658725 is a wasteful number, since it uses less digits than its factorization.

7821081658725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20869034 (or 20869029 counting only the distinct ones).

The product of its (nonzero) digits is 15052800, while the sum is 60.

The spelling of 7821081658725 in words is "seven trillion, eight hundred twenty-one billion, eighty-one million, six hundred fifty-eight thousand, seven hundred twenty-five".