161543745 has 24 divisors (see below), whose sum is σ = 305465472. Its totient is φ = 78324000.

The previous prime is 161543621. The next prime is 161543761. The reversal of 161543745 is 547345161.

161543745 = 196² + 197² + ... + 789².

161543745 is a `hidden beast` number, since 1 + 615 + 4 + 37 + 4 + 5 = 666.

It is not a de Polignac number, because 161543745 - 2⁷ = 161543617 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162681 + ... + 163670.

It is an arithmetic number, because the mean of its divisors is an integer number (12727728).

Almost surely, 2^161543745 is an apocalyptic number.

161543745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161543745 is a deficient number, since it is larger than the sum of its proper divisors (143921727).

161543745 is a wasteful number, since it uses less digits than its factorization.

161543745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326373 (or 326370 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 161543745 is about 12709.9860346107. The cubic root of 161543745 is about 544.6239248223.

The spelling of 161543745 in words is "one hundred sixty-one million, five hundred forty-three thousand, seven hundred forty-five".