66711236225 has 12 divisors (see below), whose sum is σ = 82735707180. Its totient is φ = 53360102400.

The previous prime is 66711236219. The next prime is 66711236233. The reversal of 66711236225 is 52263211766.

It can be written as a sum of positive squares in 6 ways, for example, as 108014449 + 66603221776 = 10393^2 + 258076^2 .

It is not a de Polignac number, because 66711236225 - 2⁴ = 66711236209 is a prime.

It is a Curzon number.

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, 66896 + ... + 371345.

It is an arithmetic number, because the mean of its divisors is an integer number (6894642265).

Almost surely, 2^66711236225 is an apocalyptic number.

It is an amenable number.

66711236225 is a deficient number, since it is larger than the sum of its proper divisors (16024470955).

66711236225 is a wasteful number, since it uses less digits than its factorization.

66711236225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444340 (or 444335 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The spelling of 66711236225 in words is "sixty-six billion, seven hundred eleven million, two hundred thirty-six thousand, two hundred twenty-five".