355661621680 has 80 divisors (see below), whose sum is σ = 870590037600. Its totient is φ = 134753034240.

The previous prime is 355661621663. The next prime is 355661621681. The reversal of 355661621680 is 86126166553.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (355661621681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10149790 + ... + 10184770.

It is an arithmetic number, because the mean of its divisors is an integer number (10882375470).

Almost surely, 2^355661621680 is an apocalyptic number.

It is an amenable number.

355661621680 is an abundant number, since it is smaller than the sum of its proper divisors (514928415920).

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

355661621680 is a wasteful number, since it uses less digits than its factorization.

355661621680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41702 (or 41696 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 355661621680 in words is "three hundred fifty-five billion, six hundred sixty-one million, six hundred twenty-one thousand, six hundred eighty".