66031660541 has 24 divisors (see below), whose sum is σ = 83811439296. Its totient is φ = 51443320320.

The previous prime is 66031660493. The next prime is 66031660553. The reversal of 66031660541 is 14506613066.

It is not a de Polignac number, because 66031660541 - 2¹⁴ = 66031644157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66031660495 and 66031660504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66031660571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4135325 + ... + 4151261.

It is an arithmetic number, because the mean of its divisors is an integer number (3492143304).

Almost surely, 2^66031660541 is an apocalyptic number.

It is an amenable number.

66031660541 is a deficient number, since it is larger than the sum of its proper divisors (17779778755).

66031660541 is a wasteful number, since it uses less digits than its factorization.

66031660541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23649 (or 23642 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 66031660541 in words is "sixty-six billion, thirty-one million, six hundred sixty thousand, five hundred forty-one".