67561999820 has 24 divisors (see below), whose sum is σ = 162148799904. Its totient is φ = 23164114176.

The previous prime is 67561999801. The next prime is 67561999823. The reversal of 67561999820 is 2899916576.

It is not an unprimeable number, because it can be changed into a prime (67561999823) 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 7 ways as a sum of consecutive naturals, for example, 241292717 + ... + 241292996.

It is an arithmetic number, because the mean of its divisors is an integer number (6756199996).

Almost surely, 2^67561999820 is an apocalyptic number.

It is an amenable number.

67561999820 is an abundant number, since it is smaller than the sum of its proper divisors (94586800084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67561999820 is a wasteful number, since it uses less digits than its factorization.

67561999820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482585729 (or 482585727 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 67561999820 in words is "sixty-seven billion, five hundred sixty-one million, nine hundred ninety-nine thousand, eight hundred twenty".