721006749006 has 32 divisors (see below), whose sum is σ = 1553248770048. Its totient is φ = 222470524320.

The previous prime is 721006748977. The next prime is 721006749017. The reversal of 721006749006 is 600947600127.

It is a super-2 number, since 2×721006749006² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84264861 + ... + 84273416.

It is an arithmetic number, because the mean of its divisors is an integer number (48539024064).

Almost surely, 2^721006749006 is an apocalyptic number.

721006749006 is an abundant number, since it is smaller than the sum of its proper divisors (832242021042).

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

721006749006 is a wasteful number, since it uses less digits than its factorization.

721006749006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168538336.

The product of its (nonzero) digits is 127008, while the sum is 42.

The spelling of 721006749006 in words is "seven hundred twenty-one billion, six million, seven hundred forty-nine thousand, six".