64575551 has 8 divisors (see below), whose sum is σ = 66450384. Its totient is φ = 62717760.

The previous prime is 64575529. The next prime is 64575569. The reversal of 64575551 is 15557546.

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 64575551 - 2¹⁰ = 64574527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64575521) 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, 3635 + ... + 11931.

It is an arithmetic number, because the mean of its divisors is an integer number (8306298).

Almost surely, 2^64575551 is an apocalyptic number.

64575551 is a deficient number, since it is larger than the sum of its proper divisors (1874833).

64575551 is a wasteful number, since it uses less digits than its factorization.

64575551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8521.

The product of its digits is 105000, while the sum is 38.

The square root of 64575551 is about 8035.8914253492. The cubic root of 64575551 is about 401.1954880446.

The spelling of 64575551 in words is "sixty-four million, five hundred seventy-five thousand, five hundred fifty-one".