61278588615 has 16 divisors (see below), whose sum is σ = 101208508416. Its totient is φ = 31627658400.

The previous prime is 61278588607. The next prime is 61278588629. The reversal of 61278588615 is 51688587216.

It is not a de Polignac number, because 61278588615 - 2³ = 61278588607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65890491 + ... + 65891420.

It is an arithmetic number, because the mean of its divisors is an integer number (6325531776).

Almost surely, 2^61278588615 is an apocalyptic number.

61278588615 is a deficient number, since it is larger than the sum of its proper divisors (39929919801).

61278588615 is a wasteful number, since it uses less digits than its factorization.

61278588615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131781950.

The product of its digits is 6451200, while the sum is 57.

The spelling of 61278588615 in words is "sixty-one billion, two hundred seventy-eight million, five hundred eighty-eight thousand, six hundred fifteen".