66142581124 has 9 divisors (see below), whose sum is σ = 115750417111. Its totient is φ = 33071033380.

The previous prime is 66142581091. The next prime is 66142581161. The reversal of 66142581124 is 42118524166.

The square root of 66142581124 is 257182.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×66142581124² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 450069 + ... + 578659.

Almost surely, 2^66142581124 is an apocalyptic number.

66142581124 is the 257182-nd square number.

It is an amenable number.

66142581124 is a deficient number, since it is larger than the sum of its proper divisors (49607835987).

66142581124 is an frugal number, since it uses more digits than its factorization.

66142581124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257186 (or 128593 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The spelling of 66142581124 in words is "sixty-six billion, one hundred forty-two million, five hundred eighty-one thousand, one hundred twenty-four".