61219989768 has 64 divisors (see below), whose sum is σ = 174950674560. Its totient is φ = 17487783936.

The previous prime is 61219989763. The next prime is 61219989769. The reversal of 61219989768 is 86798991216.

It is a junction number, because it is equal to n+sod(n) for n = 61219989699 and 61219989708.

It is not an unprimeable number, because it can be changed into a prime (61219989763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830346 + ... + 901062.

It is an arithmetic number, because the mean of its divisors is an integer number (2733604290).

Almost surely, 2^61219989768 is an apocalyptic number.

It is an amenable number.

61219989768 is an abundant number, since it is smaller than the sum of its proper divisors (113730684792).

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

61219989768 is a wasteful number, since it uses less digits than its factorization.

61219989768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75886 (or 75882 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 66.

The spelling of 61219989768 in words is "sixty-one billion, two hundred nineteen million, nine hundred eighty-nine thousand, seven hundred sixty-eight".