7840660660487 has 4 divisors (see below), whose sum is σ = 7840678936896. Its totient is φ = 7840642384080.

The previous prime is 7840660660471. The next prime is 7840660660531.

7840660660487 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7840660660487 - 2⁴ = 7840660660471 is a prime.

It is a super-2 number, since 2×7840660660487² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7840660660457) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8478839 + ... + 9357992.

It is an arithmetic number, because the mean of its divisors is an integer number (1960169734224).

Almost surely, 2^{7840660660487} is an apocalyptic number.

7840660660487 is a deficient number, since it is larger than the sum of its proper divisors (18276409).

7840660660487 is a wasteful number, since it uses less digits than its factorization.

7840660660487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18276408.

The product of its (nonzero) digits is 65028096, while the sum is 62.

The spelling of 7840660660487 in words is "seven trillion, eight hundred forty billion, six hundred sixty million, six hundred sixty thousand, four hundred eighty-seven".