66561234 has 8 divisors (see below), whose sum is σ = 133122480. Its totient is φ = 22187076.

The previous prime is 66561233. The next prime is 66561251. The reversal of 66561234 is 43216566.

It is a sphenic number, since it is the product of 3 distinct primes.

66561234 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66561195 and 66561204.

It is not an unprimeable number, because it can be changed into a prime (66561233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5546764 + ... + 5546775.

It is an arithmetic number, because the mean of its divisors is an integer number (16640310).

Almost surely, 2^66561234 is an apocalyptic number.

66561234 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66561234 is a wasteful number, since it uses less digits than its factorization.

66561234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093544.

The product of its digits is 25920, while the sum is 33.

The square root of 66561234 is about 8158.5068486825. The cubic root of 66561234 is about 405.2662659972.

It can be divided in two parts, 66561 and 234, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 66561234 in words is "sixty-six million, five hundred sixty-one thousand, two hundred thirty-four".