661542230 has 8 divisors (see below), whose sum is σ = 1190776032. Its totient is φ = 264616888.

The previous prime is 661542197. The next prime is 661542239. The reversal of 661542230 is 32245166.

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 = 661542193 and 661542202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661542239) 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, 33077102 + ... + 33077121.

It is an arithmetic number, because the mean of its divisors is an integer number (148847004).

Almost surely, 2^661542230 is an apocalyptic number.

661542230 is a deficient number, since it is larger than the sum of its proper divisors (529233802).

661542230 is a wasteful number, since it uses less digits than its factorization.

661542230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66154230.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 661542230 is about 25720.4632539929. The cubic root of 661542230 is about 871.3364012138.

Adding to 661542230 its reverse (32245166), we get a palindrome (693787396).

The spelling of 661542230 in words is "six hundred sixty-one million, five hundred forty-two thousand, two hundred thirty".