7721951980040 has 16 divisors (see below), whose sum is σ = 17374391955180. Its totient is φ = 3088780792000.

The previous prime is 7721951980037. The next prime is 7721951980069. The reversal of 7721951980040 is 400891591277.

It can be written as a sum of positive squares in 2 ways, for example, as 7577720650756 + 144231329284 = 2752766^2 + 379778^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96524399711 + ... + 96524399790.

Almost surely, 2^{7721951980040} is an apocalyptic number.

It is an amenable number.

7721951980040 is an abundant number, since it is smaller than the sum of its proper divisors (9652439975140).

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

7721951980040 is a wasteful number, since it uses less digits than its factorization.

7721951980040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193048799512 (or 193048799508 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 7721951980040 in words is "seven trillion, seven hundred twenty-one billion, nine hundred fifty-one million, nine hundred eighty thousand, forty".