661544234 has 8 divisors (see below), whose sum is σ = 1068648420. Its totient is φ = 305328096.

The previous prime is 661544227. The next prime is 661544237. The reversal of 661544234 is 432445166.

It can be written as a sum of positive squares in 2 ways, for example, as 593068609 + 68475625 = 24353^2 + 8275^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661544194 and 661544203.

It is not an unprimeable number, because it can be changed into a prime (661544237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12721979 + ... + 12722030.

Almost surely, 2^661544234 is an apocalyptic number.

661544234 is a deficient number, since it is larger than the sum of its proper divisors (407104186).

661544234 is a wasteful number, since it uses less digits than its factorization.

661544234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25444024.

The product of its digits is 69120, while the sum is 35.

The square root of 661544234 is about 25720.5022112711. The cubic root of 661544234 is about 871.3372810550.

The spelling of 661544234 in words is "six hundred sixty-one million, five hundred forty-four thousand, two hundred thirty-four".