72207745818 has 32 divisors (see below), whose sum is σ = 158073965952. Its totient is φ = 21853540800.

The previous prime is 72207745811. The next prime is 72207745849. The reversal of 72207745818 is 81854770227.

It is a super-2 number, since 2×72207745818² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72207745811) 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 15 ways as a sum of consecutive naturals, for example, 7583278 + ... + 7592793.

It is an arithmetic number, because the mean of its divisors is an integer number (4939811436).

Almost surely, 2^72207745818 is an apocalyptic number.

72207745818 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

72207745818 is an abundant number, since it is smaller than the sum of its proper divisors (85866220134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72207745818 is a wasteful number, since it uses less digits than its factorization.

72207745818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15176150.

The product of its (nonzero) digits is 1756160, while the sum is 51.

The spelling of 72207745818 in words is "seventy-two billion, two hundred seven million, seven hundred forty-five thousand, eight hundred eighteen".