66776008225 has 12 divisors (see below), whose sum is σ = 82858585600. Its totient is φ = 53384461200.

The previous prime is 66776008163. The next prime is 66776008259. The reversal of 66776008225 is 52280067766.

It is not a de Polignac number, because 66776008225 - 2¹⁵ = 66775975457 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, 871125 + ... + 944674.

Almost surely, 2^66776008225 is an apocalyptic number.

It is an amenable number.

66776008225 is a deficient number, since it is larger than the sum of its proper divisors (16082577375).

66776008225 is a wasteful number, since it uses less digits than its factorization.

66776008225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817280 (or 1817275 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 66776008225 in words is "sixty-six billion, seven hundred seventy-six million, eight thousand, two hundred twenty-five".