61281717280 has 48 divisors (see below), whose sum is σ = 165460639680. Its totient is φ = 21010874112.

The previous prime is 61281717253. The next prime is 61281717311. The reversal of 61281717280 is 8271718216.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27356790 + ... + 27359029.

It is an arithmetic number, because the mean of its divisors is an integer number (3447096660).

Almost surely, 2^61281717280 is an apocalyptic number.

It is an amenable number.

61281717280 is an abundant number, since it is smaller than the sum of its proper divisors (104178922400).

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

61281717280 is a wasteful number, since it uses less digits than its factorization.

61281717280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54715841 (or 54715833 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 61281717280 in words is "sixty-one billion, two hundred eighty-one million, seven hundred seventeen thousand, two hundred eighty".