161177540 has 12 divisors (see below), whose sum is σ = 338472876. Its totient is φ = 64471008.

The previous prime is 161177531. The next prime is 161177543. The reversal of 161177540 is 45771161.

It can be written as a sum of positive squares in 2 ways, for example, as 46430596 + 114746944 = 6814^2 + 10712^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161177497 and 161177506.

It is not an unprimeable number, because it can be changed into a prime (161177543) 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, 4029419 + ... + 4029458.

It is an arithmetic number, because the mean of its divisors is an integer number (28206073).

Almost surely, 2^161177540 is an apocalyptic number.

161177540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161177540 is an abundant number, since it is smaller than the sum of its proper divisors (177295336).

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

161177540 is a wasteful number, since it uses less digits than its factorization.

161177540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8058886 (or 8058884 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 161177540 is about 12695.5716688931. The cubic root of 161177540 is about 544.2120757972.

The spelling of 161177540 in words is "one hundred sixty-one million, one hundred seventy-seven thousand, five hundred forty".