18135195401 has 2 divisors, whose sum is σ = 18135195402. Its totient is φ = 18135195400.

The previous prime is 18135195389. The next prime is 18135195427. The reversal of 18135195401 is 10459153181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16364805625 + 1770389776 = 127925^2 + 42076^2 .

It is an emirp because it is prime and its reverse (10459153181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18135195401 - 2¹⁰ = 18135194377 is a prime.

It is not a weakly prime, because it can be changed into another prime (18135195301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9067597700 + 9067597701.

It is an arithmetic number, because the mean of its divisors is an integer number (9067597701).

Almost surely, 2^18135195401 is an apocalyptic number.

It is an amenable number.

18135195401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18135195401 is an equidigital number, since it uses as much as digits as its factorization.

18135195401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 38.

The spelling of 18135195401 in words is "eighteen billion, one hundred thirty-five million, one hundred ninety-five thousand, four hundred one".