66572565 has 8 divisors (see below), whose sum is σ = 106516128. Its totient is φ = 35505360.

The previous prime is 66572551. The next prime is 66572567. The reversal of 66572565 is 56527566.

It is a happy number.

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

It is not a de Polignac number, because 66572565 - 2⁷ = 66572437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66572567) 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, 2219071 + ... + 2219100.

It is an arithmetic number, because the mean of its divisors is an integer number (13314516).

Almost surely, 2^66572565 is an apocalyptic number.

It is an amenable number.

66572565 is a deficient number, since it is larger than the sum of its proper divisors (39943563).

66572565 is a wasteful number, since it uses less digits than its factorization.

66572565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438179.

The product of its digits is 378000, while the sum is 42.

The square root of 66572565 is about 8159.2012476712. The cubic root of 66572565 is about 405.2892614218.

The spelling of 66572565 in words is "sixty-six million, five hundred seventy-two thousand, five hundred sixty-five".