61584378616 has 16 divisors (see below), whose sum is σ = 117927534240. Its totient is φ = 30137036160.

The previous prime is 61584378607. The next prime is 61584378637. The reversal of 61584378616 is 61687348516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81893745 + ... + 81894496.

It is an arithmetic number, because the mean of its divisors is an integer number (7370470890).

Almost surely, 2^61584378616 is an apocalyptic number.

It is an amenable number.

61584378616 is a deficient number, since it is larger than the sum of its proper divisors (56343155624).

61584378616 is a wasteful number, since it uses less digits than its factorization.

61584378616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163788294 (or 163788290 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 61584378616 in words is "sixty-one billion, five hundred eighty-four million, three hundred seventy-eight thousand, six hundred sixteen".