61853159550 has 384 divisors, whose sum is σ = 210436531200. Its totient is φ = 11635384320.

The previous prime is 61853159519. The next prime is 61853159551. The reversal of 61853159550 is 5595135816.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61853159550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61853159551) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4401936 + ... + 4415964.

It is an arithmetic number, because the mean of its divisors is an integer number (548011800).

Almost surely, 2^61853159550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61853159550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105218265600).

61853159550 is an abundant number, since it is smaller than the sum of its proper divisors (148583371650).

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

61853159550 is a wasteful number, since it uses less digits than its factorization.

61853159550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14100 (or 14095 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 61853159550 in words is "sixty-one billion, eight hundred fifty-three million, one hundred fifty-nine thousand, five hundred fifty".