646104652425 has 36 divisors (see below), whose sum is σ = 1225318477500. Its totient is φ = 324319196160.

The previous prime is 646104652379. The next prime is 646104652429. The reversal of 646104652425 is 524256401646.

646104652425 is a `hidden beast` number, since 6 + 4 + 61 + 0 + 46 + 524 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 75529879929 + 570574772496 = 274827^2 + 755364^2 .

It is not a de Polignac number, because 646104652425 - 2¹⁴ = 646104636041 is a prime.

It is a super-3 number, since 3×646104652425³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (646104652429) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 84454300 + ... + 84461949.

It is an arithmetic number, because the mean of its divisors is an integer number (34036624375).

Almost surely, 2^646104652425 is an apocalyptic number.

It is an amenable number.

646104652425 is a deficient number, since it is larger than the sum of its proper divisors (579213825075).

646104652425 is a wasteful number, since it uses less digits than its factorization.

646104652425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168916282 (or 168916274 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 646104652425 in words is "six hundred forty-six billion, one hundred four million, six hundred fifty-two thousand, four hundred twenty-five".