64661141 has 4 divisors (see below), whose sum is σ = 66238284. Its totient is φ = 63084000.

The previous prime is 64661131. The next prime is 64661147. The reversal of 64661141 is 14116646.

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 33814225 + 30846916 = 5815^2 + 5554^2 .

It is a cyclic number.

It is not a de Polignac number, because 64661141 - 2¹⁰ = 64660117 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 (64661147) 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, 788510 + ... + 788591.

It is an arithmetic number, because the mean of its divisors is an integer number (16559571).

Almost surely, 2^64661141 is an apocalyptic number.

It is an amenable number.

64661141 is a deficient number, since it is larger than the sum of its proper divisors (1577143).

64661141 is a wasteful number, since it uses less digits than its factorization.

64661141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577142.

The product of its digits is 3456, while the sum is 29.

The square root of 64661141 is about 8041.2151444915. The cubic root of 64661141 is about 401.3726611982.

Adding to 64661141 its reverse (14116646), we get a palindrome (78777787).

The spelling of 64661141 in words is "sixty-four million, six hundred sixty-one thousand, one hundred forty-one".