66229253781 has 8 divisors (see below), whose sum is σ = 92953338720. Its totient is φ = 41829002352.

The previous prime is 66229253777. The next prime is 66229253789. The reversal of 66229253781 is 18735292266.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66229253781 - 2² = 66229253777 is a prime.

It is a super-2 number, since 2×66229253781² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66229253789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580958310 + ... + 580958423.

It is an arithmetic number, because the mean of its divisors is an integer number (11619167340).

Almost surely, 2^66229253781 is an apocalyptic number.

It is an amenable number.

66229253781 is a deficient number, since it is larger than the sum of its proper divisors (26724084939).

66229253781 is a wasteful number, since it uses less digits than its factorization.

66229253781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161916755.

The product of its digits is 2177280, while the sum is 51.

The spelling of 66229253781 in words is "sixty-six billion, two hundred twenty-nine million, two hundred fifty-three thousand, seven hundred eighty-one".