665207061078 has 32 divisors (see below), whose sum is σ = 1520583254784. Its totient is φ = 190045413792.

The previous prime is 665207061053. The next prime is 665207061089. The reversal of 665207061078 is 870160702566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22101 + ... + 1153647.

It is an arithmetic number, because the mean of its divisors is an integer number (47518226712).

Almost surely, 2^665207061078 is an apocalyptic number.

665207061078 is an abundant number, since it is smaller than the sum of its proper divisors (855376193706).

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

665207061078 is a wasteful number, since it uses less digits than its factorization.

665207061078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145556.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 665207061078 in words is "six hundred sixty-five billion, two hundred seven million, sixty-one thousand, seventy-eight".