206721465500 has 96 divisors (see below), whose sum is σ = 496883395008. Its totient is φ = 74505984000.

The previous prime is 206721465487. The next prime is 206721465521. The reversal of 206721465500 is 5564127602.

It is a super-4 number, since 4×206721465500⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 455192 + ... + 787808.

It is an arithmetic number, because the mean of its divisors is an integer number (5175868698).

Almost surely, 2^206721465500 is an apocalyptic number.

206721465500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206721465500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248441697504).

206721465500 is an abundant number, since it is smaller than the sum of its proper divisors (290161929508).

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

206721465500 is a wasteful number, since it uses less digits than its factorization.

206721465500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332760 (or 332748 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 206721465500 in words is "two hundred six billion, seven hundred twenty-one million, four hundred sixty-five thousand, five hundred".