2087916918961 has 4 divisors (see below), whose sum is σ = 2087921707300. Its totient is φ = 2087912130624.

The previous prime is 2087916918949. The next prime is 2087916918991. The reversal of 2087916918961 is 1698196197802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1743770429361 + 344146489600 = 1320519^2 + 586640^2 .

It is a cyclic number.

It is not a de Polignac number, because 2087916918961 - 2²⁵ = 2087883364529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2087916918911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666356 + ... + 2636773.

It is an arithmetic number, because the mean of its divisors is an integer number (521980426825).

Almost surely, 2^{2087916918961} is an apocalyptic number.

It is an amenable number.

2087916918961 is a deficient number, since it is larger than the sum of its proper divisors (4788339).

2087916918961 is an equidigital number, since it uses as much as digits as its factorization.

2087916918961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788338.

The product of its (nonzero) digits is 23514624, while the sum is 67.

The spelling of 2087916918961 in words is "two trillion, eighty-seven billion, nine hundred sixteen million, nine hundred eighteen thousand, nine hundred sixty-one".