75165561 has 12 divisors (see below), whose sum is σ = 108998292. Its totient is φ = 49913856.

The previous prime is 75165553. The next prime is 75165569. The reversal of 75165561 is 16556157.

It is an interprime number because it is at equal distance from previous prime (75165553) and next prime (75165569).

It can be written as a sum of positive squares in 2 ways, for example, as 69405561 + 5760000 = 8331^2 + 2400^2 .

It is not a de Polignac number, because 75165561 - 2³ = 75165553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75165569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13936 + ... + 18561.

It is an arithmetic number, because the mean of its divisors is an integer number (9083191).

Almost surely, 2^75165561 is an apocalyptic number.

It is an amenable number.

75165561 is a deficient number, since it is larger than the sum of its proper divisors (33832731).

75165561 is a wasteful number, since it uses less digits than its factorization.

75165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32760 (or 32757 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 75165561 is about 8669.8074373079. The cubic root of 75165561 is about 422.0264147194.

The spelling of 75165561 in words is "seventy-five million, one hundred sixty-five thousand, five hundred sixty-one".