647674067525 has 24 divisors (see below), whose sum is σ = 820330770024. Its totient is φ = 507082118400.

The previous prime is 647674067461. The next prime is 647674067539. The reversal of 647674067525 is 525760476746.

647674067525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 804782²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 213622369249 + 434051698276 = 462193^2 + 658826^2 .

It is not a de Polignac number, because 647674067525 - 2⁶ = 647674067461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89606 + ... + 1141655.

It is an arithmetic number, because the mean of its divisors is an integer number (34180448751).

Almost surely, 2^647674067525 is an apocalyptic number.

It is an amenable number.

647674067525 is a deficient number, since it is larger than the sum of its proper divisors (172656702499).

647674067525 is a wasteful number, since it uses less digits than its factorization.

647674067525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231721 (or 1231716 counting only the distinct ones).

The product of its (nonzero) digits is 59270400, while the sum is 59.

The spelling of 647674067525 in words is "six hundred forty-seven billion, six hundred seventy-four million, sixty-seven thousand, five hundred twenty-five".