66925985 has 16 divisors (see below), whose sum is σ = 92064000. Its totient is φ = 45752256.

The previous prime is 66925951. The next prime is 66925987. The reversal of 66925985 is 58952966.

It is a cyclic number.

It is not a de Polignac number, because 66925985 - 2¹⁰ = 66924961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66925987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9476 + ... + 14954.

It is an arithmetic number, because the mean of its divisors is an integer number (5754000).

Almost surely, 2^66925985 is an apocalyptic number.

It is an amenable number.

66925985 is a deficient number, since it is larger than the sum of its proper divisors (25138015).

66925985 is a wasteful number, since it uses less digits than its factorization.

66925985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840.

The product of its digits is 1166400, while the sum is 50.

The square root of 66925985 is about 8180.8303368301. The cubic root of 66925985 is about 406.0051949961.

The spelling of 66925985 in words is "sixty-six million, nine hundred twenty-five thousand, nine hundred eighty-five".