18103694377 has 2 divisors, whose sum is σ = 18103694378. Its totient is φ = 18103694376.

The previous prime is 18103694363. The next prime is 18103694449. The reversal of 18103694377 is 77349630181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17620969536 + 482724841 = 132744^2 + 21971^2 .

It is a cyclic number.

It is not a de Polignac number, because 18103694377 - 2⁷ = 18103694249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18103694377.

It is not a weakly prime, because it can be changed into another prime (18103694677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9051847188 + 9051847189.

It is an arithmetic number, because the mean of its divisors is an integer number (9051847189).

Almost surely, 2^18103694377 is an apocalyptic number.

It is an amenable number.

18103694377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103694377 is an equidigital number, since it uses as much as digits as its factorization.

18103694377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 18103694377 in words is "eighteen billion, one hundred three million, six hundred ninety-four thousand, three hundred seventy-seven".