18377411805 has 12 divisors (see below), whose sum is σ = 31854180540. Its totient is φ = 9801286272.

The previous prime is 18377411783. The next prime is 18377411831. The reversal of 18377411805 is 50811477381.

It can be written as a sum of positive squares in 2 ways, for example, as 8775567684 + 9601844121 = 93678^2 + 97989^2 .

It is not a de Polignac number, because 18377411805 - 2¹³ = 18377403613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 408386929 = 18377411805 / (1 + 8 + 3 + 7 + 7 + 4 + 1 + 1 + 8 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204193420 + ... + 204193509.

It is an arithmetic number, because the mean of its divisors is an integer number (2654515045).

Almost surely, 2^18377411805 is an apocalyptic number.

18377411805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18377411805 is a deficient number, since it is larger than the sum of its proper divisors (13476768735).

18377411805 is a wasteful number, since it uses less digits than its factorization.

18377411805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408386940 (or 408386937 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 18377411805 in words is "eighteen billion, three hundred seventy-seven million, four hundred eleven thousand, eight hundred five".