721659934510680 has 64 divisors (see below), whose sum is σ = 2361796149312000. Its totient is φ = 174947862911360.

The previous prime is 721659934510673. The next prime is 721659934510717. The reversal of 721659934510680 is 86015439956127.

It is a super-2 number, since 2×721659934510680² (a number of 31 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273356034480 + ... + 273356037119.

It is an arithmetic number, because the mean of its divisors is an integer number (36903064833000).

It is a 1-persistent number, because it is pandigital, but 2⋅721659934510680 = 1443319869021360 is not.

Almost surely, 2^{721659934510680} is an apocalyptic number.

It is an amenable number.

721659934510680 is an abundant number, since it is smaller than the sum of its proper divisors (1640136214801320).

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

721659934510680 is a wasteful number, since it uses less digits than its factorization.

721659934510680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546712071624 (or 546712071620 counting only the distinct ones).

The product of its (nonzero) digits is 97977600, while the sum is 66.

The spelling of 721659934510680 in words is "seven hundred twenty-one trillion, six hundred fifty-nine billion, nine hundred thirty-four million, five hundred ten thousand, six hundred eighty".