75861561 has 8 divisors (see below), whose sum is σ = 101534400. Its totient is φ = 50381552.

The previous prime is 75861523. The next prime is 75861601. The reversal of 75861561 is 16516857.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75861561 - 2¹³ = 75853369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75865561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47286 + ... + 48863.

It is an arithmetic number, because the mean of its divisors is an integer number (12691800).

Almost surely, 2^75861561 is an apocalyptic number.

It is an amenable number.

75861561 is a deficient number, since it is larger than the sum of its proper divisors (25672839).

75861561 is a wasteful number, since it uses less digits than its factorization.

75861561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96415.

The product of its digits is 50400, while the sum is 39.

The square root of 75861561 is about 8709.8542467713. The cubic root of 75861561 is about 423.3250077241.

The spelling of 75861561 in words is "seventy-five million, eight hundred sixty-one thousand, five hundred sixty-one".