64146721328 has 10 divisors (see below), whose sum is σ = 124284272604. Its totient is φ = 32073360656.

The previous prime is 64146721321. The next prime is 64146721337. The reversal of 64146721328 is 82312764146.

It is a happy number.

It is a super-2 number, since 2×64146721328² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64146721321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2004585026 + ... + 2004585057.

Almost surely, 2^64146721328 is an apocalyptic number.

It is an amenable number.

64146721328 is a deficient number, since it is larger than the sum of its proper divisors (60137551276).

64146721328 is a wasteful number, since it uses less digits than its factorization.

64146721328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009170091 (or 4009170085 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The spelling of 64146721328 in words is "sixty-four billion, one hundred forty-six million, seven hundred twenty-one thousand, three hundred twenty-eight".