7781687034564 has 48 divisors (see below), whose sum is σ = 18358728107328. Its totient is φ = 2565199945728.

The previous prime is 7781687034551. The next prime is 7781687034581. The reversal of 7781687034564 is 4654307861877.

It is a junction number, because it is equal to n+sod(n) for n = 7781687034495 and 7781687034504.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4510869 + ... + 5992604.

It is an arithmetic number, because the mean of its divisors is an integer number (382473502236).

Almost surely, 2^{7781687034564} is an apocalyptic number.

It is an amenable number.

7781687034564 is an abundant number, since it is smaller than the sum of its proper divisors (10577041072764).

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

7781687034564 is a wasteful number, since it uses less digits than its factorization.

7781687034564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10504164 (or 10504162 counting only the distinct ones).

The product of its (nonzero) digits is 189665280, while the sum is 66.

The spelling of 7781687034564 in words is "seven trillion, seven hundred eighty-one billion, six hundred eighty-seven million, thirty-four thousand, five hundred sixty-four".