7800767680021 has 8 divisors (see below), whose sum is σ = 7802397617688. Its totient is φ = 7799137920000.

The previous prime is 7800767679961. The next prime is 7800767680039. The reversal of 7800767680021 is 1200867670087.

It can be written as a sum of positive squares in 4 ways, for example, as 138450968100 + 7662316711921 = 372090^2 + 2768089^2 .

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 7800767680021 - 2⁷ = 7800767679893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7800767680061) 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, 118374001 + ... + 118439881.

It is an arithmetic number, because the mean of its divisors is an integer number (975299702211).

Almost surely, 2^{7800767680021} is an apocalyptic number.

It is an amenable number.

7800767680021 is a deficient number, since it is larger than the sum of its proper divisors (1629937667).

7800767680021 is a wasteful number, since it uses less digits than its factorization.

7800767680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88823.

The product of its (nonzero) digits is 1580544, while the sum is 52.

The spelling of 7800767680021 in words is "seven trillion, eight hundred billion, seven hundred sixty-seven million, six hundred eighty thousand, twenty-one".