721500857954 has 16 divisors (see below), whose sum is σ = 1139229178080. Its totient is φ = 341758375200.

The previous prime is 721500857933. The next prime is 721500857977. The reversal of 721500857954 is 459758005127.

It is a super-2 number, since 2×721500857954² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 721500857896 and 721500857905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3776429 + ... + 3962879.

It is an arithmetic number, because the mean of its divisors is an integer number (71201823630).

Almost surely, 2^721500857954 is an apocalyptic number.

721500857954 is a deficient number, since it is larger than the sum of its proper divisors (417728320126).

721500857954 is a wasteful number, since it uses less digits than its factorization.

721500857954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288305.

The product of its (nonzero) digits is 3528000, while the sum is 53.

The spelling of 721500857954 in words is "seven hundred twenty-one billion, five hundred million, eight hundred fifty-seven thousand, nine hundred fifty-four".