665148863665 has 32 divisors (see below), whose sum is σ = 992880395136. Its totient is φ = 420266818560.

The previous prime is 665148863663. The next prime is 665148863681. The reversal of 665148863665 is 566368841566.

It is not a de Polignac number, because 665148863665 - 2¹ = 665148863663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665148863597 and 665148863606.

It is not an unprimeable number, because it can be changed into a prime (665148863663) 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 31 ways as a sum of consecutive naturals, for example, 27348967 + ... + 27373276.

It is an arithmetic number, because the mean of its divisors is an integer number (31027512348).

Almost surely, 2^665148863665 is an apocalyptic number.

665148863665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

665148863665 is a deficient number, since it is larger than the sum of its proper divisors (327731531471).

665148863665 is a wasteful number, since it uses less digits than its factorization.

665148863665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54722289.

The product of its digits is 149299200, while the sum is 64.

The spelling of 665148863665 in words is "six hundred sixty-five billion, one hundred forty-eight million, eight hundred sixty-three thousand, six hundred sixty-five".