61547845788 has 336 divisors, whose sum is σ = 192640672896. Its totient is φ = 16951524480.

The previous prime is 61547845783. The next prime is 61547845817. The reversal of 61547845788 is 88754874516.

It is a happy number.

61547845788 is a `hidden beast` number, since 6 + 1 + 54 + 7 + 8 + 4 + 578 + 8 = 666.

It is a super-2 number, since 2×61547845788² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61547845783) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 27937095 + ... + 27939297.

It is an arithmetic number, because the mean of its divisors is an integer number (573335336).

Almost surely, 2^61547845788 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 61547845788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96320336448).

61547845788 is an abundant number, since it is smaller than the sum of its proper divisors (131092827108).

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

61547845788 is a wasteful number, since it uses less digits than its factorization.

61547845788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2299 counting only the distinct ones).

The product of its digits is 60211200, while the sum is 63.

The spelling of 61547845788 in words is "sixty-one billion, five hundred forty-seven million, eight hundred forty-five thousand, seven hundred eighty-eight".