9906778275842 has 64 divisors (see below), whose sum is σ = 17990028785664. Its totient is φ = 3999640170240.

The previous prime is 9906778275827. The next prime is 9906778275887. The reversal of 9906778275842 is 2485728776099.

It is a super-3 number, since 3×9906778275842³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9906778275842.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99255242 + ... + 99355002.

It is an arithmetic number, because the mean of its divisors is an integer number (281094199776).

Almost surely, 2^{9906778275842} is an apocalyptic number.

9906778275842 is a deficient number, since it is larger than the sum of its proper divisors (8083250509822).

9906778275842 is a wasteful number, since it uses less digits than its factorization.

9906778275842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104463.

The product of its (nonzero) digits is 853493760, while the sum is 74.

It can be divided in two parts, 990677827584 and 2, that multiplied together give a 5-th power (1981355655168 = 288⁵).

The spelling of 9906778275842 in words is "nine trillion, nine hundred six billion, seven hundred seventy-eight million, two hundred seventy-five thousand, eight hundred forty-two".