61716815 has 16 divisors (see below), whose sum is σ = 76707840. Its totient is φ = 47619360.

The previous prime is 61716799. The next prime is 61716827. The reversal of 61716815 is 51861716.

It is not a de Polignac number, because 61716815 - 2⁴ = 61716799 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67592 + ... + 68498.

It is an arithmetic number, because the mean of its divisors is an integer number (4794240).

Almost surely, 2^61716815 is an apocalyptic number.

61716815 is a deficient number, since it is larger than the sum of its proper divisors (14991025).

61716815 is a wasteful number, since it uses less digits than its factorization.

61716815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

The product of its digits is 10080, while the sum is 35.

The square root of 61716815 is about 7856.0050280025. The cubic root of 61716815 is about 395.1856521936.

The spelling of 61716815 in words is "sixty-one million, seven hundred sixteen thousand, eight hundred fifteen".