161677332 has 18 divisors (see below), whose sum is σ = 408684458. Its totient is φ = 53892432.

The previous prime is 161677331. The next prime is 161677343. The reversal of 161677332 is 233776161.

161677332 is a `hidden beast` number, since 1 + 616 + 7 + 7 + 3 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 89189136 + 72488196 = 9444^2 + 8514^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×161677332² = 52279119365276448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4491037 = 161677332 / (1 + 6 + 1 + 6 + 7 + 7 + 3 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161677331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2245483 + ... + 2245554.

Almost surely, 2^161677332 is an apocalyptic number.

161677332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161677332 is an abundant number, since it is smaller than the sum of its proper divisors (247007126).

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

161677332 is a wasteful number, since it uses less digits than its factorization.

161677332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491047 (or 4491042 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 161677332 is about 12715.2401471620. The cubic root of 161677332 is about 544.7740072470.

The spelling of 161677332 in words is "one hundred sixty-one million, six hundred seventy-seven thousand, three hundred thirty-two".