61778777787716 has 24 divisors (see below), whose sum is σ = 117941999234304. Its totient is φ = 28081096872480.

The previous prime is 61778777787707. The next prime is 61778777787823.

61778777787716 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3555566 + ... + 11670458.

It is an arithmetic number, because the mean of its divisors is an integer number (4914249968096).

Almost surely, 2^{61778777787716} is an apocalyptic number.

It is an amenable number.

61778777787716 is a deficient number, since it is larger than the sum of its proper divisors (56163221446588).

61778777787716 is a wasteful number, since it uses less digits than its factorization.

61778777787716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8287931 (or 8287929 counting only the distinct ones).

The product of its digits is 13282101504, while the sum is 86.

The spelling of 61778777787716 in words is "sixty-one trillion, seven hundred seventy-eight billion, seven hundred seventy-seven million, seven hundred eighty-seven thousand, seven hundred sixteen".