64144578733 has 4 divisors (see below), whose sum is σ = 64193657760. Its totient is φ = 64095499708.

The previous prime is 64144578677. The next prime is 64144578769. The reversal of 64144578733 is 33787544146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64144578733 - 2¹³ = 64144570541 is a prime.

It is a super-2 number, since 2×64144578733² (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 (64144573733) 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, 24537553 + ... + 24540166.

It is an arithmetic number, because the mean of its divisors is an integer number (16048414440).

Almost surely, 2^64144578733 is an apocalyptic number.

It is an amenable number.

64144578733 is a deficient number, since it is larger than the sum of its proper divisors (49079027).

64144578733 is a wasteful number, since it uses less digits than its factorization.

64144578733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49079026.

The product of its digits is 6773760, while the sum is 52.

The spelling of 64144578733 in words is "sixty-four billion, one hundred forty-four million, five hundred seventy-eight thousand, seven hundred thirty-three".