61203555840 has 480 divisors, whose sum is σ = 229959924480. Its totient is φ = 13844791296.

The previous prime is 61203555811. The next prime is 61203555851. The reversal of 61203555840 is 4855530216.

It is a tau number, because it is divible by the number of its divisors (480).

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, 38760171 + ... + 38761749.

It is an arithmetic number, because the mean of its divisors is an integer number (479083176).

Almost surely, 2^61203555840 is an apocalyptic number.

61203555840 is a gapful number since it is divisible by the number (60) 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 61203555840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114979962240).

61203555840 is an abundant number, since it is smaller than the sum of its proper divisors (168756368640).

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

61203555840 is a wasteful number, since it uses less digits than its factorization.

61203555840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722 (or 1699 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 61203555840 in words is "sixty-one billion, two hundred three million, five hundred fifty-five thousand, eight hundred forty".