61505065615 has 8 divisors (see below), whose sum is σ = 84349804320. Its totient is φ = 42174902112.

The previous prime is 61505065607. The next prime is 61505065619. The reversal of 61505065615 is 51656050516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61505065615 - 2³ = 61505065607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61505065619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878643760 + ... + 878643829.

It is an arithmetic number, because the mean of its divisors is an integer number (10543725540).

Almost surely, 2^61505065615 is an apocalyptic number.

61505065615 is a deficient number, since it is larger than the sum of its proper divisors (22844738705).

61505065615 is a wasteful number, since it uses less digits than its factorization.

61505065615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757287601.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 61505065615 in words is "sixty-one billion, five hundred five million, sixty-five thousand, six hundred fifteen".