99780405688961 has 8 divisors (see below), whose sum is σ = 105052693898880. Its totient is φ = 94510186270128.

The previous prime is 99780405688891. The next prime is 99780405688967. The reversal of 99780405688961 is 16988650408799.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99780405688961 is a prime.

It is a super-2 number, since 2×99780405688961² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99780405688967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517098761 + ... + 517291686.

It is an arithmetic number, because the mean of its divisors is an integer number (13131586737360).

Almost surely, 2^{99780405688961} is an apocalyptic number.

It is an amenable number.

99780405688961 is a deficient number, since it is larger than the sum of its proper divisors (5272288209919).

99780405688961 is a wasteful number, since it uses less digits than its factorization.

99780405688961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034395543.

The product of its (nonzero) digits is 1881169920, while the sum is 80.

The spelling of 99780405688961 in words is "ninety-nine trillion, seven hundred eighty billion, four hundred five million, six hundred eighty-eight thousand, nine hundred sixty-one".