721146721406 has 8 divisors (see below), whose sum is σ = 1083562877880. Its totient is φ = 359959095448.

The previous prime is 721146721397. The next prime is 721146721453. The reversal of 721146721406 is 604127641127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307131161 + ... + 307133508.

It is an arithmetic number, because the mean of its divisors is an integer number (135445359735).

Almost surely, 2^721146721406 is an apocalyptic number.

721146721406 is a deficient number, since it is larger than the sum of its proper divisors (362416156474).

721146721406 is a wasteful number, since it uses less digits than its factorization.

721146721406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614265258.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 721146721406 in words is "seven hundred twenty-one billion, one hundred forty-six million, seven hundred twenty-one thousand, four hundred six".