66146732281 has 4 divisors (see below), whose sum is σ = 75596265472. Its totient is φ = 56697199092.

The previous prime is 66146732273. The next prime is 66146732299. The reversal of 66146732281 is 18223764166.

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 66146732281 - 2³ = 66146732273 is a prime.

It is a super-2 number, since 2×66146732281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66146732681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4724766585 + ... + 4724766598.

It is an arithmetic number, because the mean of its divisors is an integer number (18899066368).

Almost surely, 2^66146732281 is an apocalyptic number.

It is an amenable number.

66146732281 is a deficient number, since it is larger than the sum of its proper divisors (9449533191).

66146732281 is an equidigital number, since it uses as much as digits as its factorization.

66146732281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9449533190.

The product of its digits is 580608, while the sum is 46.

The spelling of 66146732281 in words is "sixty-six billion, one hundred forty-six million, seven hundred thirty-two thousand, two hundred eighty-one".