161016720 has 40 divisors (see below), whose sum is σ = 499152576. Its totient is φ = 42937728.

The previous prime is 161016683. The next prime is 161016727. The reversal of 161016720 is 27610161.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (161016727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335212 + ... + 335691.

Almost surely, 2^161016720 is an apocalyptic number.

161016720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161016720 is an abundant number, since it is smaller than the sum of its proper divisors (338135856).

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

161016720 is a wasteful number, since it uses less digits than its factorization.

161016720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670919 (or 670913 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 161016720 is about 12689.2363836442. The cubic root of 161016720 is about 544.0310139469.

Adding to 161016720 its reverse (27610161), we get a palindrome (188626881).

The spelling of 161016720 in words is "one hundred sixty-one million, sixteen thousand, seven hundred twenty".