961806638078 has 32 divisors (see below), whose sum is σ = 1694996029440. Its totient is φ = 403539982560.

The previous prime is 961806638077. The next prime is 961806638153. The reversal of 961806638078 is 870836608169.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 961806638078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961806638077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10699403 + ... + 10788921.

It is an arithmetic number, because the mean of its divisors is an integer number (52968625920).

Almost surely, 2^961806638078 is an apocalyptic number.

961806638078 is a deficient number, since it is larger than the sum of its proper divisors (733189391362).

961806638078 is a wasteful number, since it uses less digits than its factorization.

961806638078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127112.

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 961806638078 in words is "nine hundred sixty-one billion, eight hundred six million, six hundred thirty-eight thousand, seventy-eight".