66767410481 has 4 divisors (see below), whose sum is σ = 66771796212. Its totient is φ = 66763024752.

The previous prime is 66767410469. The next prime is 66767410487. The reversal of 66767410481 is 18401476766.

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 39039832225 + 27727578256 = 197585^2 + 166516^2 .

It is a cyclic number.

It is not a de Polignac number, because 66767410481 - 2⁶ = 66767410417 is a prime.

It is a super-2 number, since 2×66767410481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66767410487) 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, 2169950 + ... + 2200503.

It is an arithmetic number, because the mean of its divisors is an integer number (16692949053).

Almost surely, 2^66767410481 is an apocalyptic number.

It is an amenable number.

66767410481 is a deficient number, since it is larger than the sum of its proper divisors (4385731).

66767410481 is a wasteful number, since it uses less digits than its factorization.

66767410481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385730.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 66767410481 in words is "sixty-six billion, seven hundred sixty-seven million, four hundred ten thousand, four hundred eighty-one".