66253868 has 24 divisors (see below), whose sum is σ = 119745024. Its totient is φ = 32054400.

The previous prime is 66253861. The next prime is 66253871. The reversal of 66253868 is 86835266.

It is a super-2 number, since 2×66253868² = 8779150049922848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66253861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19238 + ... + 22418.

It is an arithmetic number, because the mean of its divisors is an integer number (4989376).

Almost surely, 2^66253868 is an apocalyptic number.

It is an amenable number.

66253868 is a deficient number, since it is larger than the sum of its proper divisors (53491156).

66253868 is a wasteful number, since it uses less digits than its factorization.

66253868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353 (or 3351 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 66253868 is about 8139.6479039329. The cubic root of 66253868 is about 404.6414914069.

The spelling of 66253868 in words is "sixty-six million, two hundred fifty-three thousand, eight hundred sixty-eight".