66131165042 has 4 divisors (see below), whose sum is σ = 99196747566. Its totient is φ = 33065582520.

The previous prime is 66131165033. The next prime is 66131165077. The reversal of 66131165042 is 24056113166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24056113166 = 2 ⋅12028056583.

It can be written as a sum of positive squares in only one way, i.e., 65659450081 + 471714961 = 256241^2 + 21719^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66131164993 and 66131165011.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16532791259 + ... + 16532791262.

Almost surely, 2^66131165042 is an apocalyptic number.

66131165042 is a deficient number, since it is larger than the sum of its proper divisors (33065582524).

66131165042 is a wasteful number, since it uses less digits than its factorization.

66131165042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33065582523.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 66131165042 in words is "sixty-six billion, one hundred thirty-one million, one hundred sixty-five thousand, forty-two".