1681193156900 has 18 divisors (see below), whose sum is σ = 3648189150690. Its totient is φ = 672477262720.

The previous prime is 1681193156879. The next prime is 1681193156917. The reversal of 1681193156900 is 96513911861.

It can be written as a sum of positive squares in 3 ways, for example, as 293094469924 + 1388098686976 = 541382^2 + 1178176^2 .

It is a super-2 number, since 2×1681193156900² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

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, 8405965685 + ... + 8405965884.

Almost surely, 2^{1681193156900} is an apocalyptic number.

1681193156900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681193156900 is an abundant number, since it is smaller than the sum of its proper divisors (1966995993790).

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

1681193156900 is a wasteful number, since it uses less digits than its factorization.

1681193156900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16811931583 (or 16811931576 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 1681193156900 in words is "one trillion, six hundred eighty-one billion, one hundred ninety-three million, one hundred fifty-six thousand, nine hundred".