661852350872 has 16 divisors (see below), whose sum is σ = 1240982626560. Its totient is φ = 330923650464.

The previous prime is 661852350839. The next prime is 661852350877. The reversal of 661852350872 is 278053258166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661852350877) 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, 1262633 + ... + 1708199.

It is an arithmetic number, because the mean of its divisors is an integer number (77561414160).

Almost surely, 2^661852350872 is an apocalyptic number.

It is an amenable number.

661852350872 is a deficient number, since it is larger than the sum of its proper divisors (579130275688).

661852350872 is a wasteful number, since it uses less digits than its factorization.

661852350872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631250 (or 631246 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 661852350872 in words is "six hundred sixty-one billion, eight hundred fifty-two million, three hundred fifty thousand, eight hundred seventy-two".