646103152125 has 40 divisors (see below), whose sum is σ = 1204527732408. Its totient is φ = 344588342400.

The previous prime is 646103152087. The next prime is 646103152181. The reversal of 646103152125 is 521251301646.

646103152125 is a `hidden beast` number, since 6 + 4 + 6 + 103 + 1 + 521 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 179698840281 + 466404311844 = 423909^2 + 682938^2 .

It is not a de Polignac number, because 646103152125 - 2¹⁸ = 646102889981 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646103152125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31896204 + ... + 31916453.

Almost surely, 2^646103152125 is an apocalyptic number.

It is an amenable number.

646103152125 is a deficient number, since it is larger than the sum of its proper divisors (558424580283).

646103152125 is an equidigital number, since it uses as much as digits as its factorization.

646103152125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63812684 (or 63812665 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

It can be divided in two parts, 6461031 and 52125, that added together give a palindrome (6513156).

The spelling of 646103152125 in words is "six hundred forty-six billion, one hundred three million, one hundred fifty-two thousand, one hundred twenty-five".