75866561 has 4 divisors (see below), whose sum is σ = 76248000. Its totient is φ = 75485124.

The previous prime is 75866551. The next prime is 75866591. The reversal of 75866561 is 16566857.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75866561 - 2²² = 71672257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75866501) 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, 190421 + ... + 190818.

It is an arithmetic number, because the mean of its divisors is an integer number (19062000).

Almost surely, 2^75866561 is an apocalyptic number.

It is an amenable number.

75866561 is a deficient number, since it is larger than the sum of its proper divisors (381439).

75866561 is a wasteful number, since it uses less digits than its factorization.

75866561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381438.

The product of its digits is 302400, while the sum is 44.

The square root of 75866561 is about 8710.1412732515. The cubic root of 75866561 is about 423.3343079041.

The spelling of 75866561 in words is "seventy-five million, eight hundred sixty-six thousand, five hundred sixty-one".