66733541481 has 4 divisors (see below), whose sum is σ = 88978055312. Its totient is φ = 44489027652.

The previous prime is 66733541477. The next prime is 66733541489. The reversal of 66733541481 is 18414533766.

It is a happy number.

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 not a de Polignac number, because 66733541481 - 2² = 66733541477 is a prime.

It is a super-2 number, since 2×66733541481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66733541481.

It is not an unprimeable number, because it can be changed into a prime (66733541489) 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, 11122256911 + ... + 11122256916.

It is an arithmetic number, because the mean of its divisors is an integer number (22244513828).

Almost surely, 2^66733541481 is an apocalyptic number.

It is an amenable number.

66733541481 is a deficient number, since it is larger than the sum of its proper divisors (22244513831).

66733541481 is a wasteful number, since it uses less digits than its factorization.

66733541481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22244513830.

The product of its digits is 1451520, while the sum is 48.

The spelling of 66733541481 in words is "sixty-six billion, seven hundred thirty-three million, five hundred forty-one thousand, four hundred eighty-one".