1642660025 has 6 divisors (see below), whose sum is σ = 2036898462. Its totient is φ = 1314128000.

The previous prime is 1642660013. The next prime is 1642660031. The reversal of 1642660025 is 5200662461.

It can be written as a sum of positive squares in 3 ways, for example, as 567344761 + 1075315264 = 23819^2 + 32792^2 .

It is not a de Polignac number, because 1642660025 - 2¹⁴ = 1642643641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642659973 and 1642660000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32853176 + ... + 32853225.

It is an arithmetic number, because the mean of its divisors is an integer number (339483077).

Almost surely, 2^1642660025 is an apocalyptic number.

It is an amenable number.

1642660025 is a deficient number, since it is larger than the sum of its proper divisors (394238437).

1642660025 is an equidigital number, since it uses as much as digits as its factorization.

1642660025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65706411 (or 65706406 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1642660025 is about 40529.7424738919. The cubic root of 1642660025 is about 1179.9109443946.

The spelling of 1642660025 in words is "one billion, six hundred forty-two million, six hundred sixty thousand, twenty-five".