61678487616 has 28 divisors (see below), whose sum is σ = 163190998992. Its totient is φ = 20559495808.

The previous prime is 61678487599. The next prime is 61678487657.

61678487616 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 61678487616.

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, 160620870 + ... + 160621253.

It is an arithmetic number, because the mean of its divisors is an integer number (5828249964).

Almost surely, 2^61678487616 is an apocalyptic number.

It is an amenable number.

61678487616 is an abundant number, since it is smaller than the sum of its proper divisors (101512511376).

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

61678487616 is a wasteful number, since it uses less digits than its factorization.

61678487616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321242138 (or 321242128 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 60.

The spelling of 61678487616 in words is "sixty-one billion, six hundred seventy-eight million, four hundred eighty-seven thousand, six hundred sixteen".