9980918876981 has 32 divisors (see below), whose sum is σ = 11086971033600. Its totient is φ = 8927703610560.

The previous prime is 9980918876977. The next prime is 9980918877031. The reversal of 9980918876981 is 1896788190899.

It is a cyclic number.

It is not a de Polignac number, because 9980918876981 - 2² = 9980918876977 is a prime.

It is a super-2 number, since 2×9980918876981² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9980918876981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9980918836981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340178210 + ... + 340207548.

It is an arithmetic number, because the mean of its divisors is an integer number (346467844800).

Almost surely, 2^{9980918876981} is an apocalyptic number.

It is an amenable number.

9980918876981 is a deficient number, since it is larger than the sum of its proper divisors (1106052156619).

9980918876981 is a wasteful number, since it uses less digits than its factorization.

9980918876981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35729.

The product of its (nonzero) digits is 1128701952, while the sum is 83.

The spelling of 9980918876981 in words is "nine trillion, nine hundred eighty billion, nine hundred eighteen million, eight hundred seventy-six thousand, nine hundred eighty-one".