64155643 has 4 divisors (see below), whose sum is σ = 64304928. Its totient is φ = 64006360.

The previous prime is 64155629. The next prime is 64155661. The reversal of 64155643 is 34655146.

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 64155643 - 2⁹ = 64155131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64155599 and 64155608.

It is not an unprimeable number, because it can be changed into a prime (64155673) 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, 73996 + ... + 74857.

It is an arithmetic number, because the mean of its divisors is an integer number (16076232).

Almost surely, 2^64155643 is an apocalyptic number.

64155643 is a deficient number, since it is larger than the sum of its proper divisors (149285).

64155643 is a wasteful number, since it uses less digits than its factorization.

64155643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149284.

The product of its digits is 43200, while the sum is 34.

The square root of 64155643 is about 8009.7217804366. The cubic root of 64155643 is about 400.3239937493.

The spelling of 64155643 in words is "sixty-four million, one hundred fifty-five thousand, six hundred forty-three".