66131061544 has 16 divisors (see below), whose sum is σ = 124012787220. Its totient is φ = 33060984960.

The previous prime is 66131061541. The next prime is 66131061547. The reversal of 66131061544 is 44516013166.

It is an interprime number because it is at equal distance from previous prime (66131061541) and next prime (66131061547).

It can be written as a sum of positive squares in 2 ways, for example, as 52963499044 + 13167562500 = 230138^2 + 114750^2 .

It is not an unprimeable number, because it can be changed into a prime (66131061541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505999 + ... + 623134.

Almost surely, 2^66131061544 is an apocalyptic number.

It is an amenable number.

66131061544 is a deficient number, since it is larger than the sum of its proper divisors (57881725676).

66131061544 is a wasteful number, since it uses less digits than its factorization.

66131061544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136460 (or 1136456 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 66131061544 in words is "sixty-six billion, one hundred thirty-one million, sixty-one thousand, five hundred forty-four".