66988245 has 32 divisors (see below), whose sum is σ = 113933952. Its totient is φ = 33492992.

The previous prime is 66988223. The next prime is 66988247. The reversal of 66988245 is 54288966.

It is a happy number.

It is not a de Polignac number, because 66988245 - 2⁸ = 66987989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66988194 and 66988203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66988247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112669 + ... + 113261.

It is an arithmetic number, because the mean of its divisors is an integer number (3560436).

Almost surely, 2^66988245 is an apocalyptic number.

It is an amenable number.

66988245 is a deficient number, since it is larger than the sum of its proper divisors (46945707).

66988245 is a wasteful number, since it uses less digits than its factorization.

66988245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061.

The product of its digits is 829440, while the sum is 48.

The square root of 66988245 is about 8184.6346894654. The cubic root of 66988245 is about 406.1310556713.

The spelling of 66988245 in words is "sixty-six million, nine hundred eighty-eight thousand, two hundred forty-five".