66409266 has 32 divisors (see below), whose sum is σ = 165593088. Its totient is φ = 17249040.

The previous prime is 66409201. The next prime is 66409267. The reversal of 66409266 is 66290466.

It is a super-2 number, since 2×66409266² = 8820381221317512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66409267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71410 + ... + 72333.

It is an arithmetic number, because the mean of its divisors is an integer number (5174784).

Almost surely, 2^66409266 is an apocalyptic number.

66409266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66409266 is an abundant number, since it is smaller than the sum of its proper divisors (99183822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66409266 is a wasteful number, since it uses less digits than its factorization.

66409266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143766.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 66409266 is about 8149.1880577147. The cubic root of 66409266 is about 404.9576056828.

The spelling of 66409266 in words is "sixty-six million, four hundred nine thousand, two hundred sixty-six".