66904898 has 4 divisors (see below), whose sum is σ = 100357350. Its totient is φ = 33452448.

The previous prime is 66904891. The next prime is 66904919. The reversal of 66904898 is 89840966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89840966 = 2 ⋅44920483.

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 1570009 = 8083^2 + 1253^2 .

It is not an unprimeable number, because it can be changed into a prime (66904891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16726223 + ... + 16726226.

Almost surely, 2^66904898 is an apocalyptic number.

66904898 is a deficient number, since it is larger than the sum of its proper divisors (33452452).

66904898 is a wasteful number, since it uses less digits than its factorization.

66904898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33452451.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 66904898 is about 8179.5414296891. The cubic root of 66904898 is about 405.9625492241.

The spelling of 66904898 in words is "sixty-six million, nine hundred four thousand, eight hundred ninety-eight".