1681776926640 has 160 divisors (see below), whose sum is σ = 5793322536960. Its totient is φ = 448432402176.

The previous prime is 1681776926639. The next prime is 1681776926651. The reversal of 1681776926640 is 466296771861.

It is a happy number.

1681776926640 is a `hidden beast` number, since 168 + 177 + 6 + 9 + 266 + 40 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28627377 + ... + 28686063.

It is an arithmetic number, because the mean of its divisors is an integer number (36208265856).

Almost surely, 2^{1681776926640} is an apocalyptic number.

1681776926640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681776926640 is an abundant number, since it is smaller than the sum of its proper divisors (4111545610320).

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

1681776926640 is a wasteful number, since it uses less digits than its factorization.

1681776926640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71976 (or 71964 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The spelling of 1681776926640 in words is "one trillion, six hundred eighty-one billion, seven hundred seventy-six million, nine hundred twenty-six thousand, six hundred forty".