1978073832981 has 8 divisors (see below), whose sum is σ = 2792574823104. Its totient is φ = 1241144365760.

The previous prime is 1978073832979. The next prime is 1978073833003. The reversal of 1978073832981 is 1892383708791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1978073832981 - 2¹ = 1978073832979 is a prime.

It is a super-2 number, since 2×1978073832981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978073832941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19392880665 + ... + 19392880766.

It is an arithmetic number, because the mean of its divisors is an integer number (349071852888).

Almost surely, 2^{1978073832981} is an apocalyptic number.

It is an amenable number.

1978073832981 is a deficient number, since it is larger than the sum of its proper divisors (814500990123).

1978073832981 is a wasteful number, since it uses less digits than its factorization.

1978073832981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38785761451.

The product of its (nonzero) digits is 36578304, while the sum is 66.

The spelling of 1978073832981 in words is "one trillion, nine hundred seventy-eight billion, seventy-three million, eight hundred thirty-two thousand, nine hundred eighty-one".