64145381321 has 16 divisors (see below), whose sum is σ = 73567802880. Its totient is φ = 54787971840.

The previous prime is 64145381303. The next prime is 64145381341. The reversal of 64145381321 is 12318354146.

It is not a de Polignac number, because 64145381321 - 2¹⁰ = 64145380297 is a prime.

It is a super-2 number, since 2×64145381321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64145381341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2573165 + ... + 2597973.

It is an arithmetic number, because the mean of its divisors is an integer number (4597987680).

Almost surely, 2^64145381321 is an apocalyptic number.

It is an amenable number.

64145381321 is a deficient number, since it is larger than the sum of its proper divisors (9422421559).

64145381321 is a wasteful number, since it uses less digits than its factorization.

64145381321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26104.

The product of its digits is 69120, while the sum is 38.

The spelling of 64145381321 in words is "sixty-four billion, one hundred forty-five million, three hundred eighty-one thousand, three hundred twenty-one".