66031335181 has 12 divisors (see below), whose sum is σ = 76824670908. Its totient is φ = 56588922432.

The previous prime is 66031335137. The next prime is 66031335233. The reversal of 66031335181 is 18153313066.

It can be written as a sum of positive squares in 2 ways, for example, as 22151559556 + 43879775625 = 148834^2 + 209475^2 .

It is not a de Polignac number, because 66031335181 - 2¹¹ = 66031333133 is a prime.

It is a super-2 number, since 2×66031335181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66031335181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66031335121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196255 + ... + 413011.

It is an arithmetic number, because the mean of its divisors is an integer number (6402055909).

Almost surely, 2^66031335181 is an apocalyptic number.

It is an amenable number.

66031335181 is a deficient number, since it is larger than the sum of its proper divisors (10793335727).

66031335181 is a wasteful number, since it uses less digits than its factorization.

66031335181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222988 (or 222981 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 66031335181 in words is "sixty-six billion, thirty-one million, three hundred thirty-five thousand, one hundred eighty-one".