66234550553 has 4 divisors (see below), whose sum is σ = 67484259108. Its totient is φ = 64984842000.

The previous prime is 66234550549. The next prime is 66234550583. The reversal of 66234550553 is 35505543266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59835030544 + 6399520009 = 244612^2 + 79997^2 .

It is a cyclic number.

It is not a de Polignac number, because 66234550553 - 2² = 66234550549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66234550523) 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 3 ways as a sum of consecutive naturals, for example, 624854198 + ... + 624854303.

It is an arithmetic number, because the mean of its divisors is an integer number (16871064777).

Almost surely, 2^66234550553 is an apocalyptic number.

It is an amenable number.

66234550553 is a deficient number, since it is larger than the sum of its proper divisors (1249708555).

66234550553 is a wasteful number, since it uses less digits than its factorization.

66234550553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249708554.

The product of its (nonzero) digits is 1620000, while the sum is 44.

The spelling of 66234550553 in words is "sixty-six billion, two hundred thirty-four million, five hundred fifty thousand, five hundred fifty-three".