681455899400 has 24 divisors (see below), whose sum is σ = 1584384966570. Its totient is φ = 272582359680.

The previous prime is 681455899337. The next prime is 681455899429. The reversal of 681455899400 is 4998554186.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 361097635396 + 320358264004 = 600914^2 + 566002^2 .

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 681455899400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1703639549 + ... + 1703639948.

Almost surely, 2^681455899400 is an apocalyptic number.

It is an amenable number.

681455899400 is an abundant number, since it is smaller than the sum of its proper divisors (902929067170).

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

681455899400 is a wasteful number, since it uses less digits than its factorization.

681455899400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407279513 (or 3407279504 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 59.

The spelling of 681455899400 in words is "six hundred eighty-one billion, four hundred fifty-five million, eight hundred ninety-nine thousand, four hundred".