721966588227920 has 320 divisors, whose sum is σ = 2057648076380160. Its totient is φ = 230055099955200.

The previous prime is 721966588227869. The next prime is 721966588227947. The reversal of 721966588227920 is 29722885669127.

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, 5938580735 + ... + 5938702305.

It is an arithmetic number, because the mean of its divisors is an integer number (6430150238688).

Almost surely, 2^{721966588227920} is an apocalyptic number.

721966588227920 is a gapful number since it is divisible by the number (70) 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 721966588227920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028824038190080).

721966588227920 is an abundant number, since it is smaller than the sum of its proper divisors (1335681488152240).

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

721966588227920 is a wasteful number, since it uses less digits than its factorization.

721966588227920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132194 (or 132188 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 74.

The spelling of 721966588227920 in words is "seven hundred twenty-one trillion, nine hundred sixty-six billion, five hundred eighty-eight million, two hundred twenty-seven thousand, nine hundred twenty".