721543634731046 has 16 divisors (see below), whose sum is σ = 1108828965233808. Its totient is φ = 352009195293600.

The previous prime is 721543634731039. The next prime is 721543634731069. The reversal of 721543634731046 is 640137436345127.

It is a junction number, because it is equal to n+sod(n) for n = 721543634730982 and 721543634731000.

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 7 ways as a sum of consecutive naturals, for example, 18803890820 + ... + 18803929191.

It is an arithmetic number, because the mean of its divisors is an integer number (69301810327113).

Almost surely, 2^{721543634731046} is an apocalyptic number.

721543634731046 is a deficient number, since it is larger than the sum of its proper divisors (387285330502762).

721543634731046 is a wasteful number, since it uses less digits than its factorization.

721543634731046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37607820247.

The product of its (nonzero) digits is 30481920, while the sum is 56.

The spelling of 721543634731046 in words is "seven hundred twenty-one trillion, five hundred forty-three billion, six hundred thirty-four million, seven hundred thirty-one thousand, forty-six".