66127785782 has 24 divisors (see below), whose sum is σ = 106403314752. Its totient is φ = 30810164400.

The previous prime is 66127785709. The next prime is 66127785799. The reversal of 66127785782 is 28758772166.

It is a super-3 number, since 3×66127785782³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 706694 + ... + 794777.

It is an arithmetic number, because the mean of its divisors is an integer number (4433471448).

Almost surely, 2^66127785782 is an apocalyptic number.

66127785782 is a deficient number, since it is larger than the sum of its proper divisors (40275528970).

66127785782 is a wasteful number, since it uses less digits than its factorization.

66127785782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501572 (or 1501553 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 59.

The spelling of 66127785782 in words is "sixty-six billion, one hundred twenty-seven million, seven hundred eighty-five thousand, seven hundred eighty-two".