681611656010 has 16 divisors (see below), whose sum is σ = 1226912090472. Its totient is φ = 272642193600.

The previous prime is 681611656007. The next prime is 681611656069. The reversal of 681611656010 is 10656116186.

It can be written as a sum of positive squares in 4 ways, for example, as 550565484001 + 131046172009 = 742001^2 + 362003^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1204040 + ... + 1677180.

Almost surely, 2^681611656010 is an apocalyptic number.

681611656010 is a deficient number, since it is larger than the sum of its proper divisors (545300434462).

681611656010 is a wasteful number, since it uses less digits than its factorization.

681611656010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617209.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 681611656010 in words is "six hundred eighty-one billion, six hundred eleven million, six hundred fifty-six thousand, ten".