64643151 has 4 divisors (see below), whose sum is σ = 86190872. Its totient is φ = 43095432.

The previous prime is 64643099. The next prime is 64643171. The reversal of 64643151 is 15134646.

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

It is not a de Polignac number, because 64643151 - 2¹³ = 64634959 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 (64643171) 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, 10773856 + ... + 10773861.

It is an arithmetic number, because the mean of its divisors is an integer number (21547718).

Almost surely, 2^64643151 is an apocalyptic number.

64643151 is a deficient number, since it is larger than the sum of its proper divisors (21547721).

64643151 is a wasteful number, since it uses less digits than its factorization.

64643151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21547720.

The product of its digits is 8640, while the sum is 30.

The square root of 64643151 is about 8040.0964546453. The cubic root of 64643151 is about 401.3354344918.

Adding to 64643151 its reverse (15134646), we get a palindrome (79777797).

The spelling of 64643151 in words is "sixty-four million, six hundred forty-three thousand, one hundred fifty-one".