6721450064 has 20 divisors (see below), whose sum is σ = 14883211104. Its totient is φ = 2880621408.

The previous prime is 6721450061. The next prime is 6721450133. The reversal of 6721450064 is 4600541276.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721450061) 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, 30006362 + ... + 30006585.

Almost surely, 2^6721450064 is an apocalyptic number.

It is an amenable number.

6721450064 is an abundant number, since it is smaller than the sum of its proper divisors (8161761040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6721450064 is a wasteful number, since it uses less digits than its factorization.

6721450064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60012962 (or 60012956 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 6721450064 is about 81984.4501353763. The cubic root of 6721450064 is about 1887.2133156625.

The spelling of 6721450064 in words is "six billion, seven hundred twenty-one million, four hundred fifty thousand, sixty-four".