161747854720 has 64 divisors (see below), whose sum is σ = 387358912800. Its totient is φ = 64585289728.

The previous prime is 161747854693. The next prime is 161747854727. The reversal of 161747854720 is 27458747161.

It is a happy number.

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 (161747854727) 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, 142077 + ... + 586243.

Almost surely, 2^161747854720 is an apocalyptic number.

161747854720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161747854720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193679456400).

161747854720 is an abundant number, since it is smaller than the sum of its proper divisors (225611058080).

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

161747854720 is an equidigital number, since it uses as much as digits as its factorization.

161747854720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444755 (or 444743 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 161747854720 in words is "one hundred sixty-one billion, seven hundred forty-seven million, eight hundred fifty-four thousand, seven hundred twenty".