66782613055558 has 16 divisors (see below), whose sum is σ = 100717968710016. Its totient is φ = 33210239077440.

The previous prime is 66782613055541. The next prime is 66782613055577. The reversal of 66782613055558 is 85555031628766.

It is a super-3 number, since 3×66782613055558³ (a number of 42 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66782613055493 and 66782613055502.

It is a congruent number.

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, 70090791 + ... + 71037202.

It is an arithmetic number, because the mean of its divisors is an integer number (6294873044376).

Almost surely, 2^{66782613055558} is an apocalyptic number.

66782613055558 is a deficient number, since it is larger than the sum of its proper divisors (33935355654458).

66782613055558 is a wasteful number, since it uses less digits than its factorization.

66782613055558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141129279.

The product of its (nonzero) digits is 362880000, while the sum is 67.

The spelling of 66782613055558 in words is "sixty-six trillion, seven hundred eighty-two billion, six hundred thirteen million, fifty-five thousand, five hundred fifty-eight".