979081158661 has 4 divisors (see below), whose sum is σ = 1036674168012. Its totient is φ = 921488149312.

The previous prime is 979081158637. The next prime is 979081158697. The reversal of 979081158661 is 166851180979.

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 409863722436 + 569217436225 = 640206^2 + 754465^2 .

It is a cyclic number.

It is not a de Polignac number, because 979081158661 - 2¹³ = 979081150469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 979081158661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979081152661) 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 3 ways as a sum of consecutive naturals, for example, 28796504650 + ... + 28796504683.

It is an arithmetic number, because the mean of its divisors is an integer number (259168542003).

Almost surely, 2^979081158661 is an apocalyptic number.

It is an amenable number.

979081158661 is a deficient number, since it is larger than the sum of its proper divisors (57593009351).

979081158661 is a wasteful number, since it uses less digits than its factorization.

979081158661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57593009350.

The product of its (nonzero) digits is 6531840, while the sum is 61.

The spelling of 979081158661 in words is "nine hundred seventy-nine billion, eighty-one million, one hundred fifty-eight thousand, six hundred sixty-one".