18964617139609 has 4 divisors (see below), whose sum is σ = 18964663679104. Its totient is φ = 18964570600116.

The previous prime is 18964617139561. The next prime is 18964617139661. The reversal of 18964617139609 is 90693171646981.

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.

It is a cyclic number.

It is not a de Polignac number, because 18964617139609 - 2¹³ = 18964617131417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18964617139109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22653057 + ... + 23475310.

It is an arithmetic number, because the mean of its divisors is an integer number (4741165919776).

Almost surely, 2^{18964617139609} is an apocalyptic number.

It is an amenable number.

18964617139609 is a deficient number, since it is larger than the sum of its proper divisors (46539495).

18964617139609 is an equidigital number, since it uses as much as digits as its factorization.

18964617139609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46539494.

The product of its (nonzero) digits is 105815808, while the sum is 70.

The spelling of 18964617139609 in words is "eighteen trillion, nine hundred sixty-four billion, six hundred seventeen million, one hundred thirty-nine thousand, six hundred nine".