64516551 has 8 divisors (see below), whose sum is σ = 93842304. Its totient is φ = 39100920.

The previous prime is 64516537. The next prime is 64516577. The reversal of 64516551 is 15561546.

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

It is not a de Polignac number, because 64516551 - 2¹³ = 64508359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1955047 = 64516551 / (6 + 4 + 5 + 1 + 6 + 5 + 5 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64516531) 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, 977491 + ... + 977556.

It is an arithmetic number, because the mean of its divisors is an integer number (11730288).

Almost surely, 2^64516551 is an apocalyptic number.

64516551 is a deficient number, since it is larger than the sum of its proper divisors (29325753).

64516551 is a wasteful number, since it uses less digits than its factorization.

64516551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955061.

The product of its digits is 18000, while the sum is 33.

The square root of 64516551 is about 8032.2195562621. The cubic root of 64516551 is about 401.0732655935.

It can be divided in two parts, 64 and 516551, that added together give a palindrome (516615).

The spelling of 64516551 in words is "sixty-four million, five hundred sixteen thousand, five hundred fifty-one".