723504398121 has 6 divisors (see below), whose sum is σ = 1045061908410. Its totient is φ = 482336265408.

The previous prime is 723504398039. The next prime is 723504398171. The reversal of 723504398121 is 121893405327.

It is a happy number.

723504398121 is a `hidden beast` number, since 7 + 235 + 0 + 4 + 398 + 1 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 717646179600 + 5858218521 = 847140^2 + 76539^2 .

It is not a de Polignac number, because 723504398121 - 2¹³ = 723504389929 is a prime.

It is a super-2 number, since 2×723504398121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (723504398171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40194688776 + ... + 40194688793.

It is an arithmetic number, because the mean of its divisors is an integer number (174176984735).

Almost surely, 2^723504398121 is an apocalyptic number.

It is an amenable number.

723504398121 is a deficient number, since it is larger than the sum of its proper divisors (321557510289).

723504398121 is a wasteful number, since it uses less digits than its factorization.

723504398121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80389377575 (or 80389377572 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 723504398121 in words is "seven hundred twenty-three billion, five hundred four million, three hundred ninety-eight thousand, one hundred twenty-one".