161445680 has 40 divisors (see below), whose sum is σ = 409487184. Its totient is φ = 58707200.

The previous prime is 161445673. The next prime is 161445701. The reversal of 161445680 is 86544161.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 161445680.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90851 + ... + 92610.

Almost surely, 2^161445680 is an apocalyptic number.

161445680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161445680 is an abundant number, since it is smaller than the sum of its proper divisors (248041504).

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

161445680 is a wasteful number, since it uses less digits than its factorization.

161445680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183485 (or 183479 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 161445680 is about 12706.1276555841. The cubic root of 161445680 is about 544.5136980102.

The spelling of 161445680 in words is "one hundred sixty-one million, four hundred forty-five thousand, six hundred eighty".