66851825 has 12 divisors (see below), whose sum is σ = 84066048. Its totient is φ = 52726800.

The previous prime is 66851821. The next prime is 66851833. The reversal of 66851825 is 52815866.

It is not a de Polignac number, because 66851825 - 2² = 66851821 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66851821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17057 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (7005504).

Almost surely, 2^66851825 is an apocalyptic number.

It is an amenable number.

66851825 is a deficient number, since it is larger than the sum of its proper divisors (17214223).

66851825 is a wasteful number, since it uses less digits than its factorization.

66851825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37744 (or 37739 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 66851825 is about 8176.2965332723. The cubic root of 66851825 is about 405.8551761686.

It can be divided in two parts, 66851 and 825, that added together give a palindrome (67676).

The spelling of 66851825 in words is "sixty-six million, eight hundred fifty-one thousand, eight hundred twenty-five".