61609653336 has 192 divisors, whose sum is σ = 199619873280. Its totient is φ = 15661873920.

The previous prime is 61609653283. The next prime is 61609653359. The reversal of 61609653336 is 63335690616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 557326 + ... + 658658.

It is an arithmetic number, because the mean of its divisors is an integer number (1039686840).

Almost surely, 2^61609653336 is an apocalyptic number.

61609653336 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61609653336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99809936640).

61609653336 is an abundant number, since it is smaller than the sum of its proper divisors (138010219944).

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

61609653336 is a wasteful number, since it uses less digits than its factorization.

61609653336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101414 (or 101403 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 48.

The spelling of 61609653336 in words is "sixty-one billion, six hundred nine million, six hundred fifty-three thousand, three hundred thirty-six".