665148863637 has 24 divisors (see below), whose sum is σ = 974309917464. Its totient is φ = 437188368384.

The previous prime is 665148863633. The next prime is 665148863663. The reversal of 665148863637 is 736368841566.

665148863637 is a `hidden beast` number, since 6 + 6 + 514 + 8 + 86 + 3 + 6 + 37 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 96525790596 + 568623073041 = 310686^2 + 754071^2 .

It is not a de Polignac number, because 665148863637 - 2² = 665148863633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665148863633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1508383 + ... + 1898819.

It is an arithmetic number, because the mean of its divisors is an integer number (40596246561).

Almost surely, 2^665148863637 is an apocalyptic number.

It is an amenable number.

665148863637 is a deficient number, since it is larger than the sum of its proper divisors (309161053827).

665148863637 is a wasteful number, since it uses less digits than its factorization.

665148863637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393109 (or 393106 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 63.

The spelling of 665148863637 in words is "six hundred sixty-five billion, one hundred forty-eight million, eight hundred sixty-three thousand, six hundred thirty-seven".