647222561000 has 32 divisors (see below), whose sum is σ = 1514500795080. Its totient is φ = 258889024000.

The previous prime is 647222560993. The next prime is 647222561003. The reversal of 647222561000 is 165222746.

It can be written as a sum of positive squares in 4 ways, for example, as 166061140036 + 481161420964 = 407506^2 + 693658^2 .

It is not an unprimeable number, because it can be changed into a prime (647222561003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323610281 + ... + 323612280.

Almost surely, 2^647222561000 is an apocalyptic number.

It is an amenable number.

647222561000 is an abundant number, since it is smaller than the sum of its proper divisors (867278234080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647222561000 is a wasteful number, since it uses less digits than its factorization.

647222561000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647222582 (or 647222568 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 647222561000 its reverse (165222746), we get a palindrome (647387783746).

The spelling of 647222561000 in words is "six hundred forty-seven billion, two hundred twenty-two million, five hundred sixty-one thousand".