721158910560 has 384 divisors, whose sum is σ = 2848470105600. Its totient is φ = 168797583360.

The previous prime is 721158910517. The next prime is 721158910607. The reversal of 721158910560 is 65019851127.

721158910560 is a `hidden beast` number, since 7 + 2 + 1 + 1 + 5 + 89 + 1 + 0 + 560 = 666.

721158910560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1116427 + ... + 1639733.

It is an arithmetic number, because the mean of its divisors is an integer number (7417890900).

Almost surely, 2^721158910560 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 721158910560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424235052800).

721158910560 is an abundant number, since it is smaller than the sum of its proper divisors (2127311195040).

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

721158910560 is a wasteful number, since it uses less digits than its factorization.

721158910560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523371 (or 523357 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 721158910560 in words is "seven hundred twenty-one billion, one hundred fifty-eight million, nine hundred ten thousand, five hundred sixty".