66771731 has 12 divisors (see below), whose sum is σ = 73394712. Its totient is φ = 60705216.

The previous prime is 66771721. The next prime is 66771751. The reversal of 66771731 is 13717766.

It is a happy number.

It is not a de Polignac number, because 66771731 - 2⁶ = 66771667 is a prime.

It is a super-2 number, since 2×66771731² = 8916928121472722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66771721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8375 + ... + 14271.

It is an arithmetic number, because the mean of its divisors is an integer number (6116226).

Almost surely, 2^66771731 is an apocalyptic number.

66771731 is a deficient number, since it is larger than the sum of its proper divisors (6622981).

66771731 is a wasteful number, since it uses less digits than its factorization.

66771731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5990 (or 5977 counting only the distinct ones).

The product of its digits is 37044, while the sum is 38.

The square root of 66771731 is about 8171.3971265629. The cubic root of 66771731 is about 405.6930287379.

The spelling of 66771731 in words is "sixty-six million, seven hundred seventy-one thousand, seven hundred thirty-one".