72218275757 has 4 divisors (see below), whose sum is σ = 72232097376. Its totient is φ = 72204454140.

The previous prime is 72218275747. The next prime is 72218275837. The reversal of 72218275757 is 75757281227.

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.

It is a cyclic number.

It is not a de Polignac number, because 72218275757 - 2⁴ = 72218275741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72218275699 and 72218275708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72218275747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6902969 + ... + 6913422.

It is an arithmetic number, because the mean of its divisors is an integer number (18058024344).

Almost surely, 2^72218275757 is an apocalyptic number.

It is an amenable number.

72218275757 is a deficient number, since it is larger than the sum of its proper divisors (13821619).

72218275757 is a wasteful number, since it uses less digits than its factorization.

72218275757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13821618.

The product of its digits is 3841600, while the sum is 53.

The spelling of 72218275757 in words is "seventy-two billion, two hundred eighteen million, two hundred seventy-five thousand, seven hundred fifty-seven".