61780280616 has 192 divisors, whose sum is σ = 180472406400. Its totient is φ = 19053006336.

The previous prime is 61780280603. The next prime is 61780280671. The reversal of 61780280616 is 61608208716.

It is a happy number.

61780280616 is a `hidden beast` number, since 6 + 1 + 7 + 8 + 0 + 28 + 0 + 616 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4752061 + ... + 4765043.

It is an arithmetic number, because the mean of its divisors is an integer number (939960450).

Almost surely, 2^61780280616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61780280616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90236203200).

61780280616 is an abundant number, since it is smaller than the sum of its proper divisors (118692125784).

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

61780280616 is a wasteful number, since it uses less digits than its factorization.

61780280616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13120 (or 13113 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 61780280616 in words is "sixty-one billion, seven hundred eighty million, two hundred eighty thousand, six hundred sixteen".