161317454720 has 64 divisors (see below), whose sum is σ = 385719805440. Its totient is φ = 64515225600.

The previous prime is 161317454693. The next prime is 161317454723. The reversal of 161317454720 is 27454713161.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161317454723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4058945 + ... + 4098495.

It is an arithmetic number, because the mean of its divisors is an integer number (6026871960).

Almost surely, 2^161317454720 is an apocalyptic number.

161317454720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161317454720 is an abundant number, since it is smaller than the sum of its proper divisors (224402350720).

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

161317454720 is an equidigital number, since it uses as much as digits as its factorization.

161317454720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45943 (or 45931 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 161317454720 in words is "one hundred sixty-one billion, three hundred seventeen million, four hundred fifty-four thousand, seven hundred twenty".