66486946931 has 4 divisors (see below), whose sum is σ = 66491103672. Its totient is φ = 66482790192.

The previous prime is 66486946919. The next prime is 66486946937. The reversal of 66486946931 is 13964968466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66486946931 is a prime.

It is a super-2 number, since 2×66486946931² (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 (66486946937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054285 + ... + 2086398.

It is an arithmetic number, because the mean of its divisors is an integer number (16622775918).

Almost surely, 2^66486946931 is an apocalyptic number.

66486946931 is a deficient number, since it is larger than the sum of its proper divisors (4156741).

66486946931 is a wasteful number, since it uses less digits than its factorization.

66486946931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156740.

The product of its digits is 40310784, while the sum is 62.

The spelling of 66486946931 in words is "sixty-six billion, four hundred eighty-six million, nine hundred forty-six thousand, nine hundred thirty-one".