647125322481 has 81 divisors (see below), whose sum is σ = 1085205316377. Its totient is φ = 371265610320.

The previous prime is 647125322479. The next prime is 647125322521. The reversal of 647125322481 is 184223521746.

The square root of 647125322481 is 804441.

It is a perfect power (a square), and thus also a powerful number.

647125322481 is a `hidden beast` number, since 6 + 4 + 7 + 12 + 532 + 24 + 81 = 666.

It is not a de Polignac number, because 647125322481 - 2¹ = 647125322479 is a prime.

It is a super-2 number, since 2×647125322481² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647125322281) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 504383866 + ... + 504385148.

Almost surely, 2^647125322481 is an apocalyptic number.

647125322481 is the 804441-st square number.

647125322481 is the 402221-st centered octagonal number.

It is an amenable number.

647125322481 is a deficient number, since it is larger than the sum of its proper divisors (438079993896).

647125322481 is a wasteful number, since it uses less digits than its factorization.

647125322481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632 (or 1316 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The spelling of 647125322481 in words is "six hundred forty-seven billion, one hundred twenty-five million, three hundred twenty-two thousand, four hundred eighty-one".