161157760 has 32 divisors (see below), whose sum is σ = 385269300. Its totient is φ = 64462848.

The previous prime is 161157719. The next prime is 161157767. The reversal of 161157760 is 67751161.

It can be written as a sum of positive squares in 2 ways, for example, as 144576576 + 16581184 = 12024^2 + 4072^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161157767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125265 + ... + 126544.

Almost surely, 2^161157760 is an apocalyptic number.

161157760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161157760 is an abundant number, since it is smaller than the sum of its proper divisors (224111540).

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

161157760 is an equidigital number, since it uses as much as digits as its factorization.

161157760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251828 (or 251816 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 161157760 is about 12694.7926332020. The cubic root of 161157760 is about 544.1898126555.

It can be divided in two parts, 16 and 1157760, that added together give a square (1157776 = 1076²).

The spelling of 161157760 in words is "one hundred sixty-one million, one hundred fifty-seven thousand, seven hundred sixty".