66831406971 has 16 divisors (see below), whose sum is σ = 102570988800. Its totient is φ = 37914630048.

The previous prime is 66831406921. The next prime is 66831406973. The reversal of 66831406971 is 17960413866.

It is a happy number.

It is not a de Polignac number, because 66831406971 - 2¹¹ = 66831404923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66831406973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11444736 + ... + 11450573.

It is an arithmetic number, because the mean of its divisors is an integer number (6410686800).

Almost surely, 2^66831406971 is an apocalyptic number.

66831406971 is a deficient number, since it is larger than the sum of its proper divisors (35739581829).

66831406971 is a wasteful number, since it uses less digits than its factorization.

66831406971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22895458.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 66831406971 in words is "sixty-six billion, eight hundred thirty-one million, four hundred six thousand, nine hundred seventy-one".