661612142 has 8 divisors (see below), whose sum is σ = 992662776. Its totient is φ = 330724552.

The previous prime is 661612141. The next prime is 661612183. The reversal of 661612142 is 241216166.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661612141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30053 + ... + 47184.

It is an arithmetic number, because the mean of its divisors is an integer number (124082847).

Almost surely, 2^661612142 is an apocalyptic number.

661612142 is a deficient number, since it is larger than the sum of its proper divisors (331050634).

661612142 is a wasteful number, since it uses less digits than its factorization.

661612142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81522.

The product of its digits is 3456, while the sum is 29.

The square root of 661612142 is about 25721.8222915874. The cubic root of 661612142 is about 871.3670945049.

The spelling of 661612142 in words is "six hundred sixty-one million, six hundred twelve thousand, one hundred forty-two".