66888898 has 4 divisors (see below), whose sum is σ = 100333350. Its totient is φ = 33444448.

The previous prime is 66888889. The next prime is 66888907. The reversal of 66888898 is 89888866.

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

It is an interprime number because it is at equal distance from previous prime (66888889) and next prime (66888907).

It can be written as a sum of positive squares in only one way, i.e., 41254929 + 25633969 = 6423^2 + 5063^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16722223 + ... + 16722226.

Almost surely, 2^66888898 is an apocalyptic number.

66888898 is a deficient number, since it is larger than the sum of its proper divisors (33444452).

66888898 is a wasteful number, since it uses less digits than its factorization.

66888898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33444451.

The product of its digits is 10616832, while the sum is 61.

The square root of 66888898 is about 8178.5633212686. The cubic root of 66888898 is about 405.9301852825.

The spelling of 66888898 in words is "sixty-six million, eight hundred eighty-eight thousand, eight hundred ninety-eight".