7205218641 has 12 divisors (see below), whose sum is σ = 10409315280. Its totient is φ = 4802658840.

The previous prime is 7205218619. The next prime is 7205218651. The reversal of 7205218641 is 1468125027.

7205218641 is a `hidden beast` number, since 7 + 2 + 0 + 5 + 2 + 1 + 8 + 641 = 666.

It is not a de Polignac number, because 7205218641 - 2¹¹ = 7205216593 is a prime.

It is a super-2 number, since 2×7205218641² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7205218596 and 7205218605.

It is not an unprimeable number, because it can be changed into a prime (7205218651) 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 11 ways as a sum of consecutive naturals, for example, 10111 + ... + 120468.

It is an arithmetic number, because the mean of its divisors is an integer number (867442940).

Almost surely, 2^7205218641 is an apocalyptic number.

It is an amenable number.

7205218641 is a deficient number, since it is larger than the sum of its proper divisors (3204096639).

7205218641 is a wasteful number, since it uses less digits than its factorization.

7205218641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136716 (or 136713 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 7205218641 is about 84883.5593092090. The cubic root of 7205218641 is about 1931.4451882526.

The spelling of 7205218641 in words is "seven billion, two hundred five million, two hundred eighteen thousand, six hundred forty-one".