7489664641 has 4 divisors (see below), whose sum is σ = 7489886292. Its totient is φ = 7489442992.

The previous prime is 7489664617. The next prime is 7489664647. The reversal of 7489664641 is 1464669847.

7489664641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4732889616 + 2756775025 = 68796^2 + 52505^2 .

It is a cyclic number.

It is not a de Polignac number, because 7489664641 - 2⁷ = 7489664513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7489664647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48430 + ... + 131623.

It is an arithmetic number, because the mean of its divisors is an integer number (1872471573).

Almost surely, 2^7489664641 is an apocalyptic number.

It is an amenable number.

7489664641 is a deficient number, since it is larger than the sum of its proper divisors (221651).

7489664641 is a wasteful number, since it uses less digits than its factorization.

7489664641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221650.

The product of its digits is 6967296, while the sum is 55.

The square root of 7489664641 is about 86542.8485838085. The cubic root of 7489664641 is about 1956.5342614124.

The spelling of 7489664641 in words is "seven billion, four hundred eighty-nine million, six hundred sixty-four thousand, six hundred forty-one".