1978746426846 has 128 divisors (see below), whose sum is σ = 5464810229760. Its totient is φ = 517718739456.

The previous prime is 1978746426841. The next prime is 1978746426851. The reversal of 1978746426846 is 6486246478791.

1978746426846 is a `hidden beast` number, since 1 + 9 + 7 + 87 + 46 + 426 + 84 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1978746426841) and next prime (1978746426851).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978746426841) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3923430 + ... + 4398953.

It is an arithmetic number, because the mean of its divisors is an integer number (42693829920).

Almost surely, 2^{1978746426846} is an apocalyptic number.

1978746426846 is an abundant number, since it is smaller than the sum of its proper divisors (3486063802914).

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

1978746426846 is a wasteful number, since it uses less digits than its factorization.

1978746426846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322455 (or 8322449 counting only the distinct ones).

The product of its digits is 780337152, while the sum is 72.

The spelling of 1978746426846 in words is "one trillion, nine hundred seventy-eight billion, seven hundred forty-six million, four hundred twenty-six thousand, eight hundred forty-six".