66726066 has 16 divisors (see below), whose sum is σ = 145584288. Its totient is φ = 20220000.

The previous prime is 66726053. The next prime is 66726073. The reversal of 66726066 is 66062766.

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, 505435 + ... + 505566.

It is an arithmetic number, because the mean of its divisors is an integer number (9099018).

Almost surely, 2^66726066 is an apocalyptic number.

66726066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66726066 is an abundant number, since it is smaller than the sum of its proper divisors (78858222).

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

66726066 is a wasteful number, since it uses less digits than its factorization.

66726066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011017.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 66726066 is about 8168.6024508480. The cubic root of 66726066 is about 405.6005235376.

The spelling of 66726066 in words is "sixty-six million, seven hundred twenty-six thousand, sixty-six".