61329768784 has 20 divisors (see below), whose sum is σ = 118851418816. Its totient is φ = 30658434912.

The previous prime is 61329768757. The next prime is 61329768793. The reversal of 61329768784 is 48786792316.

It is a happy number.

It is a super-2 number, since 2×61329768784² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324174 + ... + 477229.

Almost surely, 2^61329768784 is an apocalyptic number.

It is an amenable number.

61329768784 is a deficient number, since it is larger than the sum of its proper divisors (57521650032).

61329768784 is a wasteful number, since it uses less digits than its factorization.

61329768784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806194 (or 806188 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The spelling of 61329768784 in words is "sixty-one billion, three hundred twenty-nine million, seven hundred sixty-eight thousand, seven hundred eighty-four".