721724243764 has 6 divisors (see below), whose sum is σ = 1263017426594. Its totient is φ = 360862121880.

The previous prime is 721724243761. The next prime is 721724243767. The reversal of 721724243764 is 467342427127.

721724243764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721724243761) and next prime (721724243767).

It can be written as a sum of positive squares in only one way, i.e., 576035460900 + 145688782864 = 758970^2 + 381692^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721724243761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90215530467 + ... + 90215530474.

Almost surely, 2^721724243764 is an apocalyptic number.

It is an amenable number.

721724243764 is a deficient number, since it is larger than the sum of its proper divisors (541293182830).

721724243764 is a wasteful number, since it uses less digits than its factorization.

721724243764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180431060945 (or 180431060943 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 49.

The spelling of 721724243764 in words is "seven hundred twenty-one billion, seven hundred twenty-four million, two hundred forty-three thousand, seven hundred sixty-four".