661954484852 has 12 divisors (see below), whose sum is σ = 1161920110176. Its totient is φ = 329977310520.

The previous prime is 661954484809. The next prime is 661954484869. The reversal of 661954484852 is 258484459166.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 249981488 + ... + 249984135.

It is an arithmetic number, because the mean of its divisors is an integer number (96826675848).

Almost surely, 2^661954484852 is an apocalyptic number.

It is an amenable number.

661954484852 is a deficient number, since it is larger than the sum of its proper divisors (499965625324).

661954484852 is a wasteful number, since it uses less digits than its factorization.

661954484852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499965958 (or 499965956 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 62.

The spelling of 661954484852 in words is "six hundred sixty-one billion, nine hundred fifty-four million, four hundred eighty-four thousand, eight hundred fifty-two".