721501458049 has 4 divisors (see below), whose sum is σ = 721614570160. Its totient is φ = 721388345940.

The previous prime is 721501458047. The next prime is 721501458079. The reversal of 721501458049 is 940854105127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 940854105127 = 73 ⋅12888412399.

It is a cyclic number.

It is not a de Polignac number, because 721501458049 - 2¹ = 721501458047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721501458047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56546487 + ... + 56559244.

It is an arithmetic number, because the mean of its divisors is an integer number (180403642540).

Almost surely, 2^721501458049 is an apocalyptic number.

It is an amenable number.

721501458049 is a deficient number, since it is larger than the sum of its proper divisors (113112111).

721501458049 is a wasteful number, since it uses less digits than its factorization.

721501458049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113112110.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 721501458049 in words is "seven hundred twenty-one billion, five hundred one million, four hundred fifty-eight thousand, forty-nine".