66142315988931 has 96 divisors (see below), whose sum is σ = 112966195722240. Its totient is φ = 33515626120704.

The previous prime is 66142315988921. The next prime is 66142315988933. The reversal of 66142315988931 is 13988951324166.

It is not a de Polignac number, because 66142315988931 - 2⁵ = 66142315988899 is a prime.

It is a super-2 number, since 2×66142315988931² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66142315988933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28405125 + ... + 30645321.

It is an arithmetic number, because the mean of its divisors is an integer number (1176731205440).

Almost surely, 2^{66142315988931} is an apocalyptic number.

66142315988931 is a deficient number, since it is larger than the sum of its proper divisors (46823879733309).

66142315988931 is a wasteful number, since it uses less digits than its factorization.

66142315988931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240373 (or 2240336 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 66.

The spelling of 66142315988931 in words is "sixty-six trillion, one hundred forty-two billion, three hundred fifteen million, nine hundred eighty-eight thousand, nine hundred thirty-one".