18071977279 has 16 divisors (see below), whose sum is σ = 19774091520. Its totient is φ = 16442081280.

The previous prime is 18071977277. The next prime is 18071977283. The reversal of 18071977279 is 97277917081.

It is a cyclic number.

It is not a de Polignac number, because 18071977279 - 2¹ = 18071977277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071977277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471127 + ... + 508039.

It is an arithmetic number, because the mean of its divisors is an integer number (1235880720).

Almost surely, 2^18071977279 is an apocalyptic number.

18071977279 is a deficient number, since it is larger than the sum of its proper divisors (1702114241).

18071977279 is a wasteful number, since it uses less digits than its factorization.

18071977279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37890.

The product of its (nonzero) digits is 3111696, while the sum is 58.

The spelling of 18071977279 in words is "eighteen billion, seventy-one million, nine hundred seventy-seven thousand, two hundred seventy-nine".