7520256641 has 4 divisors (see below), whose sum is σ = 7520460612. Its totient is φ = 7520052672.

The previous prime is 7520256637. The next prime is 7520256649. The reversal of 7520256641 is 1466520257.

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 2239182400 + 5281074241 = 47320^2 + 72671^2 .

It is a cyclic number.

It is not a de Polignac number, because 7520256641 - 2² = 7520256637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7520256595 and 7520256604.

It is not an unprimeable number, because it can be changed into a prime (7520256649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29516 + ... + 126141.

It is an arithmetic number, because the mean of its divisors is an integer number (1880115153).

Almost surely, 2^7520256641 is an apocalyptic number.

It is an amenable number.

7520256641 is a deficient number, since it is larger than the sum of its proper divisors (203971).

7520256641 is a wasteful number, since it uses less digits than its factorization.

7520256641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203970.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 7520256641 is about 86719.4132879138. The cubic root of 7520256641 is about 1959.1945045853.

Adding to 7520256641 its reverse (1466520257), we get a palindrome (8986776898).

The spelling of 7520256641 in words is "seven billion, five hundred twenty million, two hundred fifty-six thousand, six hundred forty-one".