61908811008 has 144 divisors (see below), whose sum is σ = 180133632000. Its totient is φ = 18719856640.

The previous prime is 61908810983. The next prime is 61908811021. The reversal of 61908811008 is 80011880916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4038943 + ... + 4054241.

It is an arithmetic number, because the mean of its divisors is an integer number (1250928000).

Almost surely, 2^61908811008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61908811008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90066816000).

61908811008 is an abundant number, since it is smaller than the sum of its proper divisors (118224820992).

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

61908811008 is a wasteful number, since it uses less digits than its factorization.

61908811008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15808 (or 15794 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 42.

The spelling of 61908811008 in words is "sixty-one billion, nine hundred eight million, eight hundred eleven thousand, eight".