66643025 has 12 divisors (see below), whose sum is σ = 85304064. Its totient is φ = 51594000.

The previous prime is 66642967. The next prime is 66643061. The reversal of 66643025 is 52034666.

It is not a de Polignac number, because 66643025 - 2⁸ = 66642769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66642982 and 66643000.

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, 42221 + ... + 43770.

It is an arithmetic number, because the mean of its divisors is an integer number (7108672).

Almost surely, 2^66643025 is an apocalyptic number.

It is an amenable number.

66643025 is a deficient number, since it is larger than the sum of its proper divisors (18661039).

66643025 is a wasteful number, since it uses less digits than its factorization.

66643025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86032 (or 86027 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66643025 is about 8163.5179304023. The cubic root of 66643025 is about 405.4321962405.

The spelling of 66643025 in words is "sixty-six million, six hundred forty-three thousand, twenty-five".