161757677 has 4 divisors (see below), whose sum is σ = 161894460. Its totient is φ = 161620896.

The previous prime is 161757671. The next prime is 161757683. The reversal of 161757677 is 776757161.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (161757671) and next prime (161757683).

It can be written as a sum of positive squares in 2 ways, for example, as 128913316 + 32844361 = 11354^2 + 5731^2 .

It is a cyclic number.

It is not a de Polignac number, because 161757677 - 2⁶ = 161757613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161757671) 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, 66602 + ... + 68987.

It is an arithmetic number, because the mean of its divisors is an integer number (40473615).

Almost surely, 2^161757677 is an apocalyptic number.

It is an amenable number.

161757677 is a deficient number, since it is larger than the sum of its proper divisors (136783).

161757677 is a wasteful number, since it uses less digits than its factorization.

161757677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136782.

The product of its digits is 432180, while the sum is 47.

The square root of 161757677 is about 12718.3991524091. The cubic root of 161757677 is about 544.8642334992.

The spelling of 161757677 in words is "one hundred sixty-one million, seven hundred fifty-seven thousand, six hundred seventy-seven".