7780486521680 has 40 divisors (see below), whose sum is σ = 18181456738632. Its totient is φ = 3096396660224.

The previous prime is 7780486521679. The next prime is 7780486521683. The reversal of 7780486521680 is 861256840877.

It can be written as a sum of positive squares in 4 ways, for example, as 5597255685904 + 2183230835776 = 2365852^2 + 1477576^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×7780486521680² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780486521683) 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 7 ways as a sum of consecutive naturals, for example, 246827087 + ... + 246858606.

Almost surely, 2^{7780486521680} is an apocalyptic number.

It is an amenable number.

7780486521680 is an abundant number, since it is smaller than the sum of its proper divisors (10400970216952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7780486521680 is a wasteful number, since it uses less digits than its factorization.

7780486521680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493685903 (or 493685897 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 62.

The spelling of 7780486521680 in words is "seven trillion, seven hundred eighty billion, four hundred eighty-six million, five hundred twenty-one thousand, six hundred eighty".