665430840078 has 16 divisors (see below), whose sum is σ = 1341340907520. Its totient is φ = 220063742136.

The previous prime is 665430839999. The next prime is 665430840127. The reversal of 665430840078 is 870048034566.

It is a super-2 number, since 2×665430840078² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665430840078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436633648 + ... + 436635171.

It is an arithmetic number, because the mean of its divisors is an integer number (83833806720).

Almost surely, 2^665430840078 is an apocalyptic number.

665430840078 is an abundant number, since it is smaller than the sum of its proper divisors (675910067442).

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

665430840078 is a wasteful number, since it uses less digits than its factorization.

665430840078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873268951.

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 665430840078 in words is "six hundred sixty-five billion, four hundred thirty million, eight hundred forty thousand, seventy-eight".