66031020553 has 4 divisors (see below), whose sum is σ = 66055634128. Its totient is φ = 66006406980.

The previous prime is 66031020491. The next prime is 66031020599. The reversal of 66031020553 is 35502013066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66031020553 - 2²⁵ = 65997466121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66031620553) 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, 12302763 + ... + 12308128.

It is an arithmetic number, because the mean of its divisors is an integer number (16513908532).

Almost surely, 2^66031020553 is an apocalyptic number.

It is an amenable number.

66031020553 is a deficient number, since it is larger than the sum of its proper divisors (24613575).

66031020553 is a wasteful number, since it uses less digits than its factorization.

66031020553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24613574.

The product of its (nonzero) digits is 16200, while the sum is 31.

The spelling of 66031020553 in words is "sixty-six billion, thirty-one million, twenty thousand, five hundred fifty-three".