61678415805 has 16 divisors (see below), whose sum is σ = 101092428864. Its totient is φ = 32092833920.

The previous prime is 61678415801. The next prime is 61678415849. The reversal of 61678415805 is 50851487616.

It is not a de Polignac number, because 61678415805 - 2² = 61678415801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61678415801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50144439 + ... + 50145668.

It is an arithmetic number, because the mean of its divisors is an integer number (6318276804).

Almost surely, 2^61678415805 is an apocalyptic number.

It is an amenable number.

61678415805 is a deficient number, since it is larger than the sum of its proper divisors (39414013059).

61678415805 is a wasteful number, since it uses less digits than its factorization.

61678415805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100290156.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 61678415805 in words is "sixty-one billion, six hundred seventy-eight million, four hundred fifteen thousand, eight hundred five".