661450142 has 8 divisors (see below), whose sum is σ = 994248000. Its totient is φ = 330034144.

The previous prime is 661450117. The next prime is 661450151. The reversal of 661450142 is 241054166.

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

It is a congruent number.

It is an unprimeable number.

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, 344267 + ... + 346182.

It is an arithmetic number, because the mean of its divisors is an integer number (124281000).

Almost surely, 2^661450142 is an apocalyptic number.

661450142 is a deficient number, since it is larger than the sum of its proper divisors (332797858).

661450142 is a wasteful number, since it uses less digits than its factorization.

661450142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690930.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 661450142 is about 25718.6730217560. The cubic root of 661450142 is about 871.2959687484.

The spelling of 661450142 in words is "six hundred sixty-one million, four hundred fifty thousand, one hundred forty-two".