647934021522 has 162 divisors, whose sum is σ = 1501210912383. Its totient is φ = 201954525696.

The previous prime is 647934021487. The next prime is 647934021569. The reversal of 647934021522 is 225120439746.

647934021522 is a `hidden beast` number, since 6 + 4 + 7 + 93 + 402 + 152 + 2 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 25824811401 + 622109210121 = 160701^2 + 788739^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=569181.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5733929338 + ... + 5733929450.

Almost surely, 2^647934021522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647934021522

647934021522 is an abundant number, since it is smaller than the sum of its proper divisors (853276890861).

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

647934021522 is a wasteful number, since it uses less digits than its factorization.

647934021522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 647934021522 in words is "six hundred forty-seven billion, nine hundred thirty-four million, twenty-one thousand, five hundred twenty-two".