979729377521 has 4 divisors (see below), whose sum is σ = 993150327972. Its totient is φ = 966308427072.

The previous prime is 979729377503. The next prime is 979729377563. The reversal of 979729377521 is 125773927979.

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 389206290496 + 590523087025 = 623864^2 + 768455^2 .

It is a cyclic number.

It is not a de Polignac number, because 979729377521 - 2⁶ = 979729377457 is a prime.

It is a super-2 number, since 2×979729377521² (a number of 25 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 (979729377581) 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, 6710475116 + ... + 6710475261.

It is an arithmetic number, because the mean of its divisors is an integer number (248287581993).

Almost surely, 2^979729377521 is an apocalyptic number.

It is an amenable number.

979729377521 is a deficient number, since it is larger than the sum of its proper divisors (13420950451).

979729377521 is a wasteful number, since it uses less digits than its factorization.

979729377521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13420950450.

The product of its digits is 105019740, while the sum is 68.

The spelling of 979729377521 in words is "nine hundred seventy-nine billion, seven hundred twenty-nine million, three hundred seventy-seven thousand, five hundred twenty-one".