721635770049 has 16 divisors (see below), whose sum is σ = 1006518801024. Its totient is φ = 459025952000.

The previous prime is 721635770047. The next prime is 721635770203. The reversal of 721635770049 is 940077536127.

It is a happy number.

721635770049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 721635770049 - 2¹ = 721635770047 is a prime.

It is a super-2 number, since 2×721635770049² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 721635769983 and 721635770010.

It is not an unprimeable number, because it can be changed into a prime (721635770047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13012842 + ... + 13068179.

It is an arithmetic number, because the mean of its divisors is an integer number (62907425064).

Almost surely, 2^721635770049 is an apocalyptic number.

It is an amenable number.

721635770049 is a deficient number, since it is larger than the sum of its proper divisors (284883030975).

721635770049 is a wasteful number, since it uses less digits than its factorization.

721635770049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26081448.

The product of its (nonzero) digits is 2222640, while the sum is 51.

The spelling of 721635770049 in words is "seven hundred twenty-one billion, six hundred thirty-five million, seven hundred seventy thousand, forty-nine".