65561310771000 has 128 divisors (see below), whose sum is σ = 223146861500160. Its totient is φ = 15893651088000.

The previous prime is 65561310770981. The next prime is 65561310771007. The reversal of 65561310771000 is 17701316556.

It is a super-2 number, since 2×65561310771000² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561310771007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 993320194 + ... + 993386193.

It is an arithmetic number, because the mean of its divisors is an integer number (1743334855470).

Almost surely, 2^{65561310771000} is an apocalyptic number.

65561310771000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65561310771000 is an abundant number, since it is smaller than the sum of its proper divisors (157585550729160).

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

65561310771000 is a wasteful number, since it uses less digits than its factorization.

65561310771000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986706422 (or 1986706408 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 42.

The spelling of 65561310771000 in words is "sixty-five trillion, five hundred sixty-one billion, three hundred ten million, seven hundred seventy-one thousand".