61568870440 has 192 divisors, whose sum is σ = 177577344000. Its totient is φ = 19189779840.

The previous prime is 61568870411. The next prime is 61568870459. The reversal of 61568870440 is 4407886516.

It is a Harshad number since it is a multiple of its sum of digits (49).

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, 1641577 + ... + 1678663.

It is an arithmetic number, because the mean of its divisors is an integer number (924882000).

Almost surely, 2^61568870440 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 61568870440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88788672000).

61568870440 is an abundant number, since it is smaller than the sum of its proper divisors (116008473560).

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

61568870440 is a wasteful number, since it uses less digits than its factorization.

61568870440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37141 (or 37112 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 61568870440 in words is "sixty-one billion, five hundred sixty-eight million, eight hundred seventy thousand, four hundred forty".