646420005500 has 24 divisors (see below), whose sum is σ = 1411781293104. Its totient is φ = 258568002000.

The previous prime is 646420005479. The next prime is 646420005509. The reversal of 646420005500 is 5500024646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646420005509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646419506 + ... + 646420505.

It is an arithmetic number, because the mean of its divisors is an integer number (58824220546).

Almost surely, 2^646420005500 is an apocalyptic number.

It is an amenable number.

646420005500 is an abundant number, since it is smaller than the sum of its proper divisors (765361287604).

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

646420005500 is a wasteful number, since it uses less digits than its factorization.

646420005500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292840030 (or 1292840018 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 646420005500 in words is "six hundred forty-six billion, four hundred twenty million, five thousand, five hundred".