72219535757 has 4 divisors (see below), whose sum is σ = 73208844540. Its totient is φ = 71230226976.

The previous prime is 72219535747. The next prime is 72219535777. The reversal of 72219535757 is 75753591227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30769018921 + 41450516836 = 175411^2 + 203594^2 .

It is a cyclic number.

It is not a de Polignac number, because 72219535757 - 2⁸ = 72219535501 is a prime.

It is a super-2 number, since 2×72219535757² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72219535699 and 72219535708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72219535747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494654282 + ... + 494654427.

It is an arithmetic number, because the mean of its divisors is an integer number (18302211135).

Almost surely, 2^72219535757 is an apocalyptic number.

It is an amenable number.

72219535757 is a deficient number, since it is larger than the sum of its proper divisors (989308783).

72219535757 is an equidigital number, since it uses as much as digits as its factorization.

72219535757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989308782.

The product of its digits is 4630500, while the sum is 53.

The spelling of 72219535757 in words is "seventy-two billion, two hundred nineteen million, five hundred thirty-five thousand, seven hundred fifty-seven".