66254819013 has 6 divisors (see below), whose sum is σ = 95701405254. Its totient is φ = 44169879336.

The previous prime is 66254819009. The next prime is 66254819039. The reversal of 66254819013 is 31091845266.

66254819013 is a `hidden beast` number, since 6 + 6 + 2 + 548 + 1 + 90 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35149500324 + 31105318689 = 187482^2 + 176367^2 .

It is not a de Polignac number, because 66254819013 - 2² = 66254819009 is a prime.

It is a super-4 number, since 4×66254819013⁴ (a number of 44 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66254819013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66254811013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3680823270 + ... + 3680823287.

It is an arithmetic number, because the mean of its divisors is an integer number (15950234209).

Almost surely, 2^66254819013 is an apocalyptic number.

It is an amenable number.

66254819013 is a deficient number, since it is larger than the sum of its proper divisors (29446586241).

66254819013 is a wasteful number, since it uses less digits than its factorization.

66254819013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7361646563 (or 7361646560 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 66254819013 in words is "sixty-six billion, two hundred fifty-four million, eight hundred nineteen thousand, thirteen".