721658605942 has 8 divisors (see below), whose sum is σ = 1082785061736. Its totient is φ = 360730252032.

The previous prime is 721658605937. The next prime is 721658605957. The reversal of 721658605942 is 249506856127.

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

It is a super-4 number, since 4×721658605942⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49516363 + ... + 49530934.

It is an arithmetic number, because the mean of its divisors is an integer number (135348132717).

Almost surely, 2^721658605942 is an apocalyptic number.

721658605942 is a deficient number, since it is larger than the sum of its proper divisors (361126455794).

721658605942 is a wasteful number, since it uses less digits than its factorization.

721658605942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99050942.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 721658605942 in words is "seven hundred twenty-one billion, six hundred fifty-eight million, six hundred five thousand, nine hundred forty-two".