66142350331 has 4 divisors (see below), whose sum is σ = 66153197664. Its totient is φ = 66131503000.

The previous prime is 66142350319. The next prime is 66142350341. The reversal of 66142350331 is 13305324166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13305324166 = 2 ⋅6652662083.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66142350331 is a prime.

It is a super-2 number, since 2×66142350331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66142350311) 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, 5414515 + ... + 5426716.

It is an arithmetic number, because the mean of its divisors is an integer number (16538299416).

Almost surely, 2^66142350331 is an apocalyptic number.

66142350331 is a deficient number, since it is larger than the sum of its proper divisors (10847333).

66142350331 is a wasteful number, since it uses less digits than its factorization.

66142350331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10847332.

The product of its (nonzero) digits is 38880, while the sum is 34.

Adding to 66142350331 its reverse (13305324166), we get a palindrome (79447674497).

The spelling of 66142350331 in words is "sixty-six billion, one hundred forty-two million, three hundred fifty thousand, three hundred thirty-one".