646375339025 has 12 divisors (see below), whose sum is σ = 863159683932. Its totient is φ = 477323327040.

The previous prime is 646375338991. The next prime is 646375339081. The reversal of 646375339025 is 520933573646.

It can be written as a sum of positive squares in 6 ways, for example, as 193704734161 + 452670604864 = 440119^2 + 672808^2 .

It is not a de Polignac number, because 646375339025 - 2¹² = 646375334929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 994423274 + ... + 994423923.

It is an arithmetic number, because the mean of its divisors is an integer number (71929973661).

Almost surely, 2^646375339025 is an apocalyptic number.

646375339025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

646375339025 is a deficient number, since it is larger than the sum of its proper divisors (216784344907).

646375339025 is a wasteful number, since it uses less digits than its factorization.

646375339025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988847220 (or 1988847215 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 53.

The spelling of 646375339025 in words is "six hundred forty-six billion, three hundred seventy-five million, three hundred thirty-nine thousand, twenty-five".