66783740555505 has 32 divisors (see below), whose sum is σ = 107399890224000. Its totient is φ = 35436038303232.

The previous prime is 66783740555471. The next prime is 66783740555533. The reversal of 66783740555505 is 50555504738766.

It is not a de Polignac number, because 66783740555505 - 2⁸ = 66783740555249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94470846 + ... + 95175144.

It is an arithmetic number, because the mean of its divisors is an integer number (3356246569500).

Almost surely, 2^{66783740555505} is an apocalyptic number.

It is an amenable number.

66783740555505 is a deficient number, since it is larger than the sum of its proper divisors (40616149668495).

66783740555505 is a wasteful number, since it uses less digits than its factorization.

66783740555505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736593.

The product of its (nonzero) digits is 529200000, while the sum is 66.

The spelling of 66783740555505 in words is "sixty-six trillion, seven hundred eighty-three billion, seven hundred forty million, five hundred fifty-five thousand, five hundred five".