18979630777 has 8 divisors (see below), whose sum is σ = 19173077000. Its totient is φ = 18786536064.

The previous prime is 18979630729. The next prime is 18979630781. The reversal of 18979630777 is 77703697981.

It can be written as a sum of positive squares in 4 ways, for example, as 3856534201 + 15123096576 = 62101^2 + 122976^2 .

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 18979630777 - 2¹¹ = 18979628729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18979630577) 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, 21349 + ... + 195997.

It is an arithmetic number, because the mean of its divisors is an integer number (2396634625).

Almost surely, 2^18979630777 is an apocalyptic number.

It is an amenable number.

18979630777 is a deficient number, since it is larger than the sum of its proper divisors (193446223).

18979630777 is a wasteful number, since it uses less digits than its factorization.

18979630777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175755.

The product of its (nonzero) digits is 28005264, while the sum is 64.

The spelling of 18979630777 in words is "eighteen billion, nine hundred seventy-nine million, six hundred thirty thousand, seven hundred seventy-seven".