646605226525 has 6 divisors (see below), whose sum is σ = 801790480922. Its totient is φ = 517284181200.

The previous prime is 646605226493. The next prime is 646605226567. The reversal of 646605226525 is 525622506646.

It can be written as a sum of positive squares in 3 ways, for example, as 107113507524 + 539491719001 = 327282^2 + 734501^2 .

It is not a de Polignac number, because 646605226525 - 2⁵ = 646605226493 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 5 ways as a sum of consecutive naturals, for example, 12932104506 + ... + 12932104555.

Almost surely, 2^646605226525 is an apocalyptic number.

It is an amenable number.

646605226525 is a deficient number, since it is larger than the sum of its proper divisors (155185254397).

646605226525 is a wasteful number, since it uses less digits than its factorization.

646605226525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25864209071 (or 25864209066 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 646605226525 in words is "six hundred forty-six billion, six hundred five million, two hundred twenty-six thousand, five hundred twenty-five".