7212725618 has 54 divisors (see below), whose sum is σ = 13191822189. Its totient is φ = 2948842512.

The previous prime is 7212725593. The next prime is 7212725627. The reversal of 7212725618 is 8165272127.

It can be written as a sum of positive squares in 2 ways, for example, as 7199013409 + 13712209 = 84847^2 + 3703^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=60053.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19336880 + ... + 19337252.

Almost surely, 2^7212725618 is an apocalyptic number.

7212725618 is a deficient number, since it is larger than the sum of its proper divisors (5979096571).

7212725618 is an equidigital number, since it uses as much as digits as its factorization.

7212725618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 405 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 7212725618 is about 84927.7670611915. The cubic root of 7212725618 is about 1932.1157338077.

The spelling of 7212725618 in words is "seven billion, two hundred twelve million, seven hundred twenty-five thousand, six hundred eighteen".