75566909 has 4 divisors (see below), whose sum is σ = 82436640. Its totient is φ = 68697180.

The previous prime is 75566903. The next prime is 75566917. The reversal of 75566909 is 90966557.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90966557 = 11 ⋅8269687.

It is a cyclic number.

It is not a de Polignac number, because 75566909 - 2¹² = 75562813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75566903) 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, 3434849 + ... + 3434870.

It is an arithmetic number, because the mean of its divisors is an integer number (20609160).

Almost surely, 2^75566909 is an apocalyptic number.

It is an amenable number.

75566909 is a deficient number, since it is larger than the sum of its proper divisors (6869731).

75566909 is a wasteful number, since it uses less digits than its factorization.

75566909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6869730.

The product of its (nonzero) digits is 510300, while the sum is 47.

The square root of 75566909 is about 8692.9229261509. The cubic root of 75566909 is about 422.7762212266.

The spelling of 75566909 in words is "seventy-five million, five hundred sixty-six thousand, nine hundred nine".