64841551 has 4 divisors (see below), whose sum is σ = 64863232. Its totient is φ = 64819872.

The previous prime is 64841527. The next prime is 64841599. The reversal of 64841551 is 15514846.

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

It is a cyclic number.

It is not a de Polignac number, because 64841551 - 2⁷ = 64841423 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 (64841521) 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, 5466 + ... + 12631.

It is an arithmetic number, because the mean of its divisors is an integer number (16215808).

Almost surely, 2^64841551 is an apocalyptic number.

64841551 is a deficient number, since it is larger than the sum of its proper divisors (21681).

64841551 is a wasteful number, since it uses less digits than its factorization.

64841551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680.

The product of its digits is 19200, while the sum is 34.

The square root of 64841551 is about 8052.4251626451. The cubic root of 64841551 is about 401.7456023497.

The spelling of 64841551 in words is "sixty-four million, eight hundred forty-one thousand, five hundred fifty-one".