75256561 has 8 divisors (see below), whose sum is σ = 78084864. Its totient is φ = 72453360.

The previous prime is 75256553. The next prime is 75256589. The reversal of 75256561 is 16565257.

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 75256561 - 2³ = 75256553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75256561.

It is not an unprimeable number, because it can be changed into a prime (75256591) 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, 55 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (9760608).

Almost surely, 2^75256561 is an apocalyptic number.

It is an amenable number.

75256561 is a deficient number, since it is larger than the sum of its proper divisors (2828303).

75256561 is a wasteful number, since it uses less digits than its factorization.

75256561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12551.

The product of its digits is 63000, while the sum is 37.

The square root of 75256561 is about 8675.0539479591. The cubic root of 75256561 is about 422.1966563185.

The spelling of 75256561 in words is "seventy-five million, two hundred fifty-six thousand, five hundred sixty-one".