18405012777 has 16 divisors (see below), whose sum is σ = 26722344000. Its totient is φ = 11223382464.

The previous prime is 18405012721. The next prime is 18405012797. The reversal of 18405012777 is 77721050481.

It is not a de Polignac number, because 18405012777 - 2⁷ = 18405012649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18405012797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5565502 + ... + 5568807.

It is an arithmetic number, because the mean of its divisors is an integer number (1670146500).

Almost surely, 2^18405012777 is an apocalyptic number.

It is an amenable number.

18405012777 is a deficient number, since it is larger than the sum of its proper divisors (8317331223).

18405012777 is a wasteful number, since it uses less digits than its factorization.

18405012777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11134360.

The product of its (nonzero) digits is 109760, while the sum is 42.

The spelling of 18405012777 in words is "eighteen billion, four hundred five million, twelve thousand, seven hundred seventy-seven".