64347354721 has 32 divisors (see below), whose sum is σ = 74355418368. Its totient is φ = 55159910400.

The previous prime is 64347354677. The next prime is 64347354737. The reversal of 64347354721 is 12745374346.

It is a happy number.

It is not a de Polignac number, because 64347354721 - 2¹³ = 64347346529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64347354761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5663196 + ... + 5674546.

It is an arithmetic number, because the mean of its divisors is an integer number (2323606824).

Almost surely, 2^64347354721 is an apocalyptic number.

It is an amenable number.

64347354721 is a deficient number, since it is larger than the sum of its proper divisors (10008063647).

64347354721 is a wasteful number, since it uses less digits than its factorization.

64347354721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11721.

The product of its digits is 1693440, while the sum is 46.

The spelling of 64347354721 in words is "sixty-four billion, three hundred forty-seven million, three hundred fifty-four thousand, seven hundred twenty-one".