66549552783 has 32 divisors (see below), whose sum is σ = 102529981440. Its totient is φ = 37609962240.

The previous prime is 66549552781. The next prime is 66549552799. The reversal of 66549552783 is 38725594566.

It is a Cunningham number, because it is equal to 257972²-1.

It is not a de Polignac number, because 66549552783 - 2¹ = 66549552781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66549552781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 730918 + ... + 816908.

It is an arithmetic number, because the mean of its divisors is an integer number (3204061920).

Almost surely, 2^66549552783 is an apocalyptic number.

66549552783 is a deficient number, since it is larger than the sum of its proper divisors (35980428657).

66549552783 is a wasteful number, since it uses less digits than its factorization.

66549552783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86407.

The product of its digits is 54432000, while the sum is 60.

The spelling of 66549552783 in words is "sixty-six billion, five hundred forty-nine million, five hundred fifty-two thousand, seven hundred eighty-three".