681400741408 has 12 divisors (see below), whose sum is σ = 1341507709710. Its totient is φ = 340700370688.

The previous prime is 681400741397. The next prime is 681400741429. The reversal of 681400741408 is 804147004186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 561138824464 + 120261916944 = 749092^2 + 346788^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646886553 + ... + 10646886616.

Almost surely, 2^681400741408 is an apocalyptic number.

It is an amenable number.

681400741408 is a deficient number, since it is larger than the sum of its proper divisors (660106968302).

681400741408 is a wasteful number, since it uses less digits than its factorization.

681400741408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21293773179 (or 21293773171 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 681400741408 in words is "six hundred eighty-one billion, four hundred million, seven hundred forty-one thousand, four hundred eight".