25000066066 has 4 divisors (see below), whose sum is σ = 37500099102. Its totient is φ = 12500033032.

The previous prime is 25000066037. The next prime is 25000066109. The reversal of 25000066066 is 66066000052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 23208999025 + 1791067041 = 152345^2 + 42321^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250016515 + ... + 6250016518.

Almost surely, 2^25000066066 is an apocalyptic number.

25000066066 is a deficient number, since it is larger than the sum of its proper divisors (12500033036).

25000066066 is a wasteful number, since it uses less digits than its factorization.

25000066066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500033035.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 25000066066 in words is "twenty-five billion, sixty-six thousand, sixty-six".