61649921008984 has 128 divisors (see below), whose sum is σ = 144672163361280. Its totient is φ = 23926926643200.

The previous prime is 61649921008967. The next prime is 61649921008997. The reversal of 61649921008984 is 48980012994616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561455592 + ... + 561565384.

It is an arithmetic number, because the mean of its divisors is an integer number (1130251276260).

Almost surely, 2^{61649921008984} 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 61649921008984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72336081680640).

61649921008984 is an abundant number, since it is smaller than the sum of its proper divisors (83022242352296).

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

61649921008984 is a wasteful number, since it uses less digits than its factorization.

61649921008984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113321 (or 113317 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 61649921008984 in words is "sixty-one trillion, six hundred forty-nine billion, nine hundred twenty-one million, eight thousand, nine hundred eighty-four".