64144747277 has 4 divisors (see below), whose sum is σ = 69078958620. Its totient is φ = 59210535936.

The previous prime is 64144747237. The next prime is 64144747297. The reversal of 64144747277 is 77274744146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77274744146 = 2 ⋅38637372073.

It can be written as a sum of positive squares in 2 ways, for example, as 19956082756 + 44188664521 = 141266^2 + 210211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64144747277 is a prime.

It is a super-2 number, since 2×64144747277² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64144747217) 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, 2467105652 + ... + 2467105677.

It is an arithmetic number, because the mean of its divisors is an integer number (17269739655).

Almost surely, 2^64144747277 is an apocalyptic number.

It is an amenable number.

64144747277 is a deficient number, since it is larger than the sum of its proper divisors (4934211343).

64144747277 is a wasteful number, since it uses less digits than its factorization.

64144747277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934211342.

The product of its digits is 7375872, while the sum is 53.

The spelling of 64144747277 in words is "sixty-four billion, one hundred forty-four million, seven hundred forty-seven thousand, two hundred seventy-seven".