66189898 has 16 divisors (see below), whose sum is σ = 104426496. Its totient is φ = 31421520.

The previous prime is 66189889. The next prime is 66189911. The reversal of 66189898 is 89898166.

It is a super-2 number, since 2×66189898² = 8762205194500808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6786 + ... + 13357.

It is an arithmetic number, because the mean of its divisors is an integer number (6526656).

Almost surely, 2^66189898 is an apocalyptic number.

66189898 is a deficient number, since it is larger than the sum of its proper divisors (38236598).

66189898 is a wasteful number, since it uses less digits than its factorization.

66189898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20229.

The product of its digits is 1492992, while the sum is 55.

The square root of 66189898 is about 8135.7174238047. The cubic root of 66189898 is about 404.5112185019.

The spelling of 66189898 in words is "sixty-six million, one hundred eighty-nine thousand, eight hundred ninety-eight".