687562813613 has 16 divisors (see below), whose sum is σ = 792090860400. Its totient is φ = 591181479936.

The previous prime is 687562813607. The next prime is 687562813627. The reversal of 687562813613 is 316318265786.

It can be written as a sum of positive squares in 8 ways, for example, as 72801753124 + 614761060489 = 269818^2 + 784067^2 .

It is a cyclic number.

It is not a de Polignac number, because 687562813613 - 2⁶ = 687562813549 is a prime.

It is a super-2 number, since 2×687562813613² (a number of 24 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 (687562813603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16015388 + ... + 16058261.

It is an arithmetic number, because the mean of its divisors is an integer number (49505678775).

Almost surely, 2^687562813613 is an apocalyptic number.

It is an amenable number.

687562813613 is a deficient number, since it is larger than the sum of its proper divisors (104528046787).

687562813613 is a wasteful number, since it uses less digits than its factorization.

687562813613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32073776.

The product of its digits is 8709120, while the sum is 56.

The spelling of 687562813613 in words is "six hundred eighty-seven billion, five hundred sixty-two million, eight hundred thirteen thousand, six hundred thirteen".