66498857 has 4 divisors (see below), whose sum is σ = 66866436. Its totient is φ = 66131280.

The previous prime is 66498833. The next prime is 66498863. The reversal of 66498857 is 75889466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4734976 + 61763881 = 2176^2 + 7859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66498857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66498799 and 66498808.

It is not an unprimeable number, because it can be changed into a prime (66498557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183518 + ... + 183879.

It is an arithmetic number, because the mean of its divisors is an integer number (16716609).

Almost surely, 2^66498857 is an apocalyptic number.

It is an amenable number.

66498857 is a deficient number, since it is larger than the sum of its proper divisors (367579).

66498857 is a wasteful number, since it uses less digits than its factorization.

66498857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367578.

The product of its digits is 2903040, while the sum is 53.

The square root of 66498857 is about 8154.6831330224. The cubic root of 66498857 is about 405.1396297497.

The spelling of 66498857 in words is "sixty-six million, four hundred ninety-eight thousand, eight hundred fifty-seven".