64551617 has 4 divisors (see below), whose sum is σ = 69517140. Its totient is φ = 59586096.

The previous prime is 64551577. The next prime is 64551623. The reversal of 64551617 is 71615546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41357761 + 23193856 = 6431^2 + 4816^2 .

It is a cyclic number.

It is not a de Polignac number, because 64551617 - 2¹⁸ = 64289473 is a prime.

It is a super-2 number, since 2×64551617² = 8333822514629378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64551647) 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, 2482742 + ... + 2482767.

It is an arithmetic number, because the mean of its divisors is an integer number (17379285).

Almost surely, 2^64551617 is an apocalyptic number.

It is an amenable number.

64551617 is a deficient number, since it is larger than the sum of its proper divisors (4965523).

64551617 is a wasteful number, since it uses less digits than its factorization.

64551617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965522.

The product of its digits is 25200, while the sum is 35.

The square root of 64551617 is about 8034.4020934977. The cubic root of 64551617 is about 401.1459161390.

The spelling of 64551617 in words is "sixty-four million, five hundred fifty-one thousand, six hundred seventeen".