66126666486931 has 16 divisors (see below), whose sum is σ = 66454890882688. Its totient is φ = 65799242308800.

The previous prime is 66126666486929. The next prime is 66126666486953. The reversal of 66126666486931 is 13968466662166.

It is a cyclic number.

It is not a de Polignac number, because 66126666486931 - 2¹ = 66126666486929 is a prime.

It is a super-2 number, since 2×66126666486931² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66126666486131) 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, 2667138271 + ... + 2667163063.

It is an arithmetic number, because the mean of its divisors is an integer number (4153430680168).

Almost surely, 2^{66126666486931} is an apocalyptic number.

66126666486931 is the 4694915-th hex number.

66126666486931 is a deficient number, since it is larger than the sum of its proper divisors (328224395757).

66126666486931 is a wasteful number, since it uses less digits than its factorization.

66126666486931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40402.

The product of its digits is 483729408, while the sum is 70.

The spelling of 66126666486931 in words is "sixty-six trillion, one hundred twenty-six billion, six hundred sixty-six million, four hundred eighty-six thousand, nine hundred thirty-one".