64155145 has 4 divisors (see below), whose sum is σ = 76986180. Its totient is φ = 51324112.

The previous prime is 64155137. The next prime is 64155173. The reversal of 64155145 is 54155146.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48497296 + 15657849 = 6964^2 + 3957^2 .

It is a cyclic number.

It is not a de Polignac number, because 64155145 - 2³ = 64155137 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6415510 + ... + 6415519.

It is an arithmetic number, because the mean of its divisors is an integer number (19246545).

Almost surely, 2^64155145 is an apocalyptic number.

It is an amenable number.

64155145 is a deficient number, since it is larger than the sum of its proper divisors (12831035).

64155145 is a wasteful number, since it uses less digits than its factorization.

64155145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12831034.

The product of its digits is 12000, while the sum is 31.

The square root of 64155145 is about 8009.6906931541. The cubic root of 64155145 is about 400.3229579253.

Subtracting from 64155145 its reverse (54155146), we obtain a palindrome (9999999).

The spelling of 64155145 in words is "sixty-four million, one hundred fifty-five thousand, one hundred forty-five".