18436987064979 has 96 divisors (see below), whose sum is σ = 31988320000000. Its totient is φ = 10393638488064.

The previous prime is 18436987064933. The next prime is 18436987065017. The reversal of 18436987064979 is 97946078963481.

18436987064979 is a `hidden beast` number, since 1 + 8 + 4 + 36 + 98 + 7 + 0 + 6 + 497 + 9 = 666.

It is not a de Polignac number, because 18436987064979 - 2¹⁹ = 18436986540691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a junction number, because it is equal to n+sod(n) for n = 18436987064898 and 18436987064907.

It is not an unprimeable number, because it can be changed into a prime (18436987064179) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 167784447 + ... + 167894295.

Almost surely, 2^{18436987064979} is an apocalyptic number.

18436987064979 is a deficient number, since it is larger than the sum of its proper divisors (13551332935021).

18436987064979 is a wasteful number, since it uses less digits than its factorization.

18436987064979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111199 (or 111187 counting only the distinct ones).

The product of its (nonzero) digits is 3950456832, while the sum is 81.

The spelling of 18436987064979 in words is "eighteen trillion, four hundred thirty-six billion, nine hundred eighty-seven million, sixty-four thousand, nine hundred seventy-nine".