61778442108 has 24 divisors (see below), whose sum is σ = 147502018048. Its totient is φ = 20113911216.

The previous prime is 61778442053. The next prime is 61778442109. The reversal of 61778442108 is 80124487716.

61778442108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61778442109) 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, 59862316 + ... + 59863347.

Almost surely, 2^61778442108 is an apocalyptic number.

It is an amenable number.

61778442108 is an abundant number, since it is smaller than the sum of its proper divisors (85723575940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61778442108 is a wasteful number, since it uses less digits than its factorization.

61778442108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119725713 (or 119725711 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 61778442108 in words is "sixty-one billion, seven hundred seventy-eight million, four hundred forty-two thousand, one hundred eight".