61718877570 has 288 divisors, whose sum is σ = 184604650560. Its totient is φ = 13164103680.

The previous prime is 61718877569. The next prime is 61718877581. The reversal of 61718877570 is 7577881716.

It is a self number, because there is not a number n which added to its sum of digits gives 61718877570.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 55652176 + ... + 55653284.

It is an arithmetic number, because the mean of its divisors is an integer number (640988370).

Almost surely, 2^61718877570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61718877570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92302325280).

61718877570 is an abundant number, since it is smaller than the sum of its proper divisors (122885772990).

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

61718877570 is a wasteful number, since it uses less digits than its factorization.

61718877570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 4609920, while the sum is 57.

The spelling of 61718877570 in words is "sixty-one billion, seven hundred eighteen million, eight hundred seventy-seven thousand, five hundred seventy".