665161230784 has 28 divisors (see below), whose sum is σ = 1321556953528. Its totient is φ = 332170502400.

The previous prime is 665161230763. The next prime is 665161230857. The reversal of 665161230784 is 487032161566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6355707 + ... + 6459514.

It is an arithmetic number, because the mean of its divisors is an integer number (47198462626).

Almost surely, 2^665161230784 is an apocalyptic number.

665161230784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

665161230784 is a deficient number, since it is larger than the sum of its proper divisors (656395722744).

665161230784 is a wasteful number, since it uses less digits than its factorization.

665161230784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12816044 (or 12816034 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 665161230784 in words is "six hundred sixty-five billion, one hundred sixty-one million, two hundred thirty thousand, seven hundred eighty-four".