687662196516 has 27 divisors (see below), whose sum is σ = 1738269796081. Its totient is φ = 229219073664.

The previous prime is 687662196511. The next prime is 687662196517. The reversal of 687662196516 is 615691266786.

The square root of 687662196516 is 829254.

It is a perfect power (a square), and thus also a powerful number.

687662196516 is a `hidden beast` number, since 6 + 8 + 7 + 6 + 6 + 21 + 96 + 516 = 666.

It can be written as a sum of positive squares in only one way, i.e., 213216756516 + 474445440000 = 461754^2 + 688800^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687662196511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4906420 + ... + 5044628.

Almost surely, 2^687662196516 is an apocalyptic number.

687662196516 is the 829254-th square number.

It is an amenable number.

687662196516 is an abundant number, since it is smaller than the sum of its proper divisors (1050607599565).

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

687662196516 is an frugal number, since it uses more digits than its factorization.

687662196516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276428 (or 138214 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 687662196516 in words is "six hundred eighty-seven billion, six hundred sixty-two million, one hundred ninety-six thousand, five hundred sixteen".