61784338256 has 40 divisors (see below), whose sum is σ = 120273685920. Its totient is φ = 30746301824.

The previous prime is 61784338241. The next prime is 61784338261. The reversal of 61784338256 is 65283348716.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 61784338198 and 61784338207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3082475 + ... + 3102453.

It is an arithmetic number, because the mean of its divisors is an integer number (3006842148).

Almost surely, 2^61784338256 is an apocalyptic number.

It is an amenable number.

61784338256 is a deficient number, since it is larger than the sum of its proper divisors (58489347664).

61784338256 is a wasteful number, since it uses less digits than its factorization.

61784338256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20891 (or 20885 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

It can be divided in two parts, 6178 and 4338256, that added together give a palindrome (4344434).

The spelling of 61784338256 in words is "sixty-one billion, seven hundred eighty-four million, three hundred thirty-eight thousand, two hundred fifty-six".