66881625 has 16 divisors (see below), whose sum is σ = 111291648. Its totient is φ = 35670000.

The previous prime is 66881623. The next prime is 66881699. The reversal of 66881625 is 52618866.

It is not a de Polignac number, because 66881625 - 2¹ = 66881623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66881623) 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, 88801 + ... + 89550.

It is an arithmetic number, because the mean of its divisors is an integer number (6955728).

Almost surely, 2^66881625 is an apocalyptic number.

It is an amenable number.

66881625 is a deficient number, since it is larger than the sum of its proper divisors (44410023).

66881625 is a wasteful number, since it uses less digits than its factorization.

66881625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178369 (or 178359 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 66881625 is about 8178.1186711859. The cubic root of 66881625 is about 405.9154721421.

The spelling of 66881625 in words is "sixty-six million, eight hundred eighty-one thousand, six hundred twenty-five".