65557774812 has 24 divisors (see below), whose sum is σ = 152977773312. Its totient is φ = 21851215600.

The previous prime is 65557774771. The next prime is 65557774859. The reversal of 65557774812 is 21847775556.

It is a super-3 number, since 3×65557774812³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36637 + ... + 363947.

It is an arithmetic number, because the mean of its divisors is an integer number (6374073888).

Almost surely, 2^65557774812 is an apocalyptic number.

It is an amenable number.

65557774812 is an abundant number, since it is smaller than the sum of its proper divisors (87419998500).

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

65557774812 is a wasteful number, since it uses less digits than its factorization.

65557774812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344009 (or 344007 counting only the distinct ones).

The product of its digits is 16464000, while the sum is 57.

The spelling of 65557774812 in words is "sixty-five billion, five hundred fifty-seven million, seven hundred seventy-four thousand, eight hundred twelve".