61543720080 has 160 divisors (see below), whose sum is σ = 212114459520. Its totient is φ = 16401553920.

The previous prime is 61543720061. The next prime is 61543720081. The reversal of 61543720080 is 8002734516.

61543720080 is a `hidden beast` number, since 6 + 15 + 437 + 200 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (61543720081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3903894 + ... + 3919626.

It is an arithmetic number, because the mean of its divisors is an integer number (1325715372).

Almost surely, 2^61543720080 is an apocalyptic number.

61543720080 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 61543720080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106057229760).

61543720080 is an abundant number, since it is smaller than the sum of its proper divisors (150570739440).

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

61543720080 is a wasteful number, since it uses less digits than its factorization.

61543720080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17566 (or 17554 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 61543720080 in words is "sixty-one billion, five hundred forty-three million, seven hundred twenty thousand, eighty".