665653131792 has 240 divisors, whose sum is σ = 2223700799040. Its totient is φ = 189847342080.

The previous prime is 665653131779. The next prime is 665653131797. The reversal of 665653131792 is 297131356566.

665653131792 is a `hidden beast` number, since 6 + 6 + 5 + 6 + 531 + 3 + 17 + 92 = 666.

It is a super-2 number, since 2×665653131792² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (665653131797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 514083 + ... + 1263165.

It is an arithmetic number, because the mean of its divisors is an integer number (9265419996).

Almost surely, 2^665653131792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665653131792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111850399520).

665653131792 is an abundant number, since it is smaller than the sum of its proper divisors (1558047667248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665653131792 is a wasteful number, since it uses less digits than its factorization.

665653131792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749139 (or 749116 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 54.

The spelling of 665653131792 in words is "six hundred sixty-five billion, six hundred fifty-three million, one hundred thirty-one thousand, seven hundred ninety-two".