9976780621972 has 24 divisors (see below), whose sum is σ = 17472462259392. Its totient is φ = 4984649644800.

The previous prime is 9976780621963. The next prime is 9976780621979. The reversal of 9976780621972 is 2791260876799.

It is a junction number, because it is equal to n+sod(n) for n = 9976780621895 and 9976780621904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9976780621979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37194697 + ... + 37461967.

It is an arithmetic number, because the mean of its divisors is an integer number (728019260808).

Almost surely, 2^{9976780621972} is an apocalyptic number.

It is an amenable number.

9976780621972 is a deficient number, since it is larger than the sum of its proper divisors (7495681637420).

9976780621972 is a wasteful number, since it uses less digits than its factorization.

9976780621972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274239 (or 274237 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 73.

The spelling of 9976780621972 in words is "nine trillion, nine hundred seventy-six billion, seven hundred eighty million, six hundred twenty-one thousand, nine hundred seventy-two".