61563869960 has 64 divisors (see below), whose sum is σ = 141282766080. Its totient is φ = 24138177280.

The previous prime is 61563869953. The next prime is 61563869993. The reversal of 61563869960 is 6996836516.

61563869960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61563869960² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61563869960.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 428669 + ... + 553971.

It is an arithmetic number, because the mean of its divisors is an integer number (2207543220).

Almost surely, 2^61563869960 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 61563869960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70641383040).

61563869960 is an abundant number, since it is smaller than the sum of its proper divisors (79718896120).

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

61563869960 is a wasteful number, since it uses less digits than its factorization.

61563869960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125558 (or 125554 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 61563869960 in words is "sixty-one billion, five hundred sixty-three million, eight hundred sixty-nine thousand, nine hundred sixty".