66999413331 has 20 divisors (see below), whose sum is σ = 100588510000. Its totient is φ = 44441811216.

The previous prime is 66999413329. The next prime is 66999413357. The reversal of 66999413331 is 13331499966.

It is not a de Polignac number, because 66999413331 - 2¹ = 66999413329 is a prime.

It is a super-2 number, since 2×66999413331² (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 (66999413311) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2062156 + ... + 2094393.

It is an arithmetic number, because the mean of its divisors is an integer number (5029425500).

Almost surely, 2^66999413331 is an apocalyptic number.

66999413331 is a deficient number, since it is larger than the sum of its proper divisors (33589096669).

66999413331 is a wasteful number, since it uses less digits than its factorization.

66999413331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156760 (or 4156751 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 54.

The spelling of 66999413331 in words is "sixty-six billion, nine hundred ninety-nine million, four hundred thirteen thousand, three hundred thirty-one".