625765847281 has 4 divisors (see below), whose sum is σ = 641028428964. Its totient is φ = 610503265600.

The previous prime is 625765847269. The next prime is 625765847297. The reversal of 625765847281 is 182748567526.

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 100987306225 + 524778541056 = 317785^2 + 724416^2 .

It is a cyclic number.

It is not a de Polignac number, because 625765847281 - 2¹⁹ = 625765322993 is a prime.

It is a super-2 number, since 2×625765847281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625765247281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7631290780 + ... + 7631290861.

It is an arithmetic number, because the mean of its divisors is an integer number (160257107241).

Almost surely, 2^625765847281 is an apocalyptic number.

It is an amenable number.

625765847281 is a deficient number, since it is larger than the sum of its proper divisors (15262581683).

625765847281 is a wasteful number, since it uses less digits than its factorization.

625765847281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15262581682.

The product of its digits is 45158400, while the sum is 61.

The spelling of 625765847281 in words is "six hundred twenty-five billion, seven hundred sixty-five million, eight hundred forty-seven thousand, two hundred eighty-one".