18909471701 has 4 divisors (see below), whose sum is σ = 18916449504. Its totient is φ = 18902493900.

The previous prime is 18909471661. The next prime is 18909471709. The reversal of 18909471701 is 10717490981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10717490981 = 47 ⋅228031723.

It is a cyclic number.

It is not a de Polignac number, because 18909471701 - 2²⁶ = 18842362837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909471709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3484835 + ... + 3490256.

It is an arithmetic number, because the mean of its divisors is an integer number (4729112376).

Almost surely, 2^18909471701 is an apocalyptic number.

It is an amenable number.

18909471701 is a deficient number, since it is larger than the sum of its proper divisors (6977803).

18909471701 is an equidigital number, since it uses as much as digits as its factorization.

18909471701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6977802.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 18909471701 in words is "eighteen billion, nine hundred nine million, four hundred seventy-one thousand, seven hundred one".