64551871 has 4 divisors (see below), whose sum is σ = 65144200. Its totient is φ = 63959544.

The previous prime is 64551859. The next prime is 64551881. The reversal of 64551871 is 17815546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64551871 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 64551871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64551881) 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, 296001 + ... + 296218.

It is an arithmetic number, because the mean of its divisors is an integer number (16286050).

Almost surely, 2^64551871 is an apocalyptic number.

64551871 is a deficient number, since it is larger than the sum of its proper divisors (592329).

64551871 is a wasteful number, since it uses less digits than its factorization.

64551871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592328.

The product of its digits is 33600, while the sum is 37.

The square root of 64551871 is about 8034.4179005078. The cubic root of 64551871 is about 401.1464422860.

The spelling of 64551871 in words is "sixty-four million, five hundred fifty-one thousand, eight hundred seventy-one".