61717278899 has 8 divisors (see below), whose sum is σ = 63872803920. Its totient is φ = 59563576800.

The previous prime is 61717278877. The next prime is 61717278913. The reversal of 61717278899 is 99887271716.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61717278899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61717278829) 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, 386657 + ... + 522434.

It is an arithmetic number, because the mean of its divisors is an integer number (7984100490).

Almost surely, 2^61717278899 is an apocalyptic number.

61717278899 is a deficient number, since it is larger than the sum of its proper divisors (2155525021).

61717278899 is a wasteful number, since it uses less digits than its factorization.

61717278899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911461.

The product of its digits is 21337344, while the sum is 65.

The spelling of 61717278899 in words is "sixty-one billion, seven hundred seventeen million, two hundred seventy-eight thousand, eight hundred ninety-nine".