61303779216 has 135 divisors (see below), whose sum is σ = 175693643931. Its totient is φ = 19954256832.

The previous prime is 61303779149. The next prime is 61303779233. The reversal of 61303779216 is 61297730316.

The square root of 61303779216 is 247596.

It is a perfect power (a square), and thus also a powerful number.

61303779216 is a `hidden beast` number, since 61 + 3 + 0 + 377 + 9 + 216 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 139643925 + ... + 139644363.

Almost surely, 2^61303779216 is an apocalyptic number.

61303779216 is the 247596-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61303779216

61303779216 is an abundant number, since it is smaller than the sum of its proper divisors (114389864715).

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

61303779216 is an equidigital number, since it uses as much as digits as its factorization.

61303779216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 61303779216 in words is "sixty-one billion, three hundred three million, seven hundred seventy-nine thousand, two hundred sixteen".