661303144656514 has 8 divisors (see below), whose sum is σ = 992306598765840. Its totient is φ = 330534278401236.

The previous prime is 661303144656491. The next prime is 661303144656647. The reversal of 661303144656514 is 415656441303166.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58646956464 + ... + 58646967739.

It is an arithmetic number, because the mean of its divisors is an integer number (124038324845730).

Almost surely, 2^{661303144656514} is an apocalyptic number.

661303144656514 is a deficient number, since it is larger than the sum of its proper divisors (331003454109326).

661303144656514 is a wasteful number, since it uses less digits than its factorization.

661303144656514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117293927024.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 661303144656514 in words is "six hundred sixty-one trillion, three hundred three billion, one hundred forty-four million, six hundred fifty-six thousand, five hundred fourteen".