6665324457981 has 96 divisors (see below), whose sum is σ = 10863426355200. Its totient is φ = 3560140108800.

The previous prime is 6665324457941. The next prime is 6665324458021. The reversal of 6665324457981 is 1897544235666.

It is an interprime number because it is at equal distance from previous prime (6665324457941) and next prime (6665324458021).

It is not a de Polignac number, because 6665324457981 - 2⁷ = 6665324457853 is a prime.

It is a super-2 number, since 2×6665324457981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665324457941) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 766212970 + ... + 766221668.

It is an arithmetic number, because the mean of its divisors is an integer number (113160691200).

Almost surely, 2^{6665324457981} is an apocalyptic number.

It is an amenable number.

6665324457981 is a deficient number, since it is larger than the sum of its proper divisors (4198101897219).

6665324457981 is a wasteful number, since it uses less digits than its factorization.

6665324457981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9595 (or 9578 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 66.

The spelling of 6665324457981 in words is "six trillion, six hundred sixty-five billion, three hundred twenty-four million, four hundred fifty-seven thousand, nine hundred eighty-one".