61778236417 has 8 divisors (see below), whose sum is σ = 64671534720. Its totient is φ = 58902212160.

The previous prime is 61778236379. The next prime is 61778236511. The reversal of 61778236417 is 71463287716.

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

It is a cyclic number.

It is not a de Polignac number, because 61778236417 - 2¹¹ = 61778234369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61778296417) 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, 4311192 + ... + 4325497.

It is an arithmetic number, because the mean of its divisors is an integer number (8083941840).

Almost surely, 2^61778236417 is an apocalyptic number.

It is an amenable number.

61778236417 is a deficient number, since it is larger than the sum of its proper divisors (2893298303).

61778236417 is a wasteful number, since it uses less digits than its factorization.

61778236417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8637023.

The product of its digits is 2370816, while the sum is 52.

The spelling of 61778236417 in words is "sixty-one billion, seven hundred seventy-eight million, two hundred thirty-six thousand, four hundred seventeen".