1681355755550 has 12 divisors (see below), whose sum is σ = 3127321705416. Its totient is φ = 672542302200.

The previous prime is 1681355755537. The next prime is 1681355755559. The reversal of 1681355755550 is 555575531861.

It is a happy number.

It is a super-2 number, since 2×1681355755550² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681355755559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16813557506 + ... + 16813557605.

It is an arithmetic number, because the mean of its divisors is an integer number (260610142118).

Almost surely, 2^{1681355755550} is an apocalyptic number.

1681355755550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681355755550 is a deficient number, since it is larger than the sum of its proper divisors (1445965949866).

1681355755550 is a wasteful number, since it uses less digits than its factorization.

1681355755550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33627115123 (or 33627115118 counting only the distinct ones).

The product of its (nonzero) digits is 15750000, while the sum is 56.

The spelling of 1681355755550 in words is "one trillion, six hundred eighty-one billion, three hundred fifty-five million, seven hundred fifty-five thousand, five hundred fifty".