641646425 has 18 divisors (see below), whose sum is σ = 925543998. Its totient is φ = 439985280.

The previous prime is 641646413. The next prime is 641646437. The reversal of 641646425 is 524646146.

It is an interprime number because it is at equal distance from previous prime (641646413) and next prime (641646437).

It can be written as a sum of positive squares in 3 ways, for example, as 98942809 + 542703616 = 9947^2 + 23296^2 .

It is not a de Polignac number, because 641646425 - 2⁴ = 641646409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 260672 + ... + 263121.

It is an arithmetic number, because the mean of its divisors is an integer number (51419111).

Almost surely, 2^641646425 is an apocalyptic number.

It is an amenable number.

641646425 is a deficient number, since it is larger than the sum of its proper divisors (283897573).

641646425 is a wasteful number, since it uses less digits than its factorization.

641646425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523817 (or 523805 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 641646425 is about 25330.7407116334. The cubic root of 641646425 is about 862.5122255496.

The spelling of 641646425 in words is "six hundred forty-one million, six hundred forty-six thousand, four hundred twenty-five".