721501458012 has 144 divisors (see below), whose sum is σ = 2039135847840. Its totient is φ = 213762502656.

The previous prime is 721501457921. The next prime is 721501458023. The reversal of 721501458012 is 210854105127.

It is a happy number.

721501458012 is a `hidden beast` number, since 7 + 2 + 1 + 50 + 14 + 580 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3588208 + ... + 3783944.

It is an arithmetic number, because the mean of its divisors is an integer number (14160665610).

Almost surely, 2^721501458012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721501458012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019567923920).

721501458012 is an abundant number, since it is smaller than the sum of its proper divisors (1317634389828).

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

721501458012 is a wasteful number, since it uses less digits than its factorization.

721501458012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196100 (or 196095 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 721501458012 in words is "seven hundred twenty-one billion, five hundred one million, four hundred fifty-eight thousand, twelve".