18643701536377 has 4 divisors (see below), whose sum is σ = 19624948985680. Its totient is φ = 17662454087076.

The previous prime is 18643701536347. The next prime is 18643701536387. The reversal of 18643701536377 is 77363510734681.

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 a de Polignac number, because none of the positive numbers 2^k-18643701536377 is a prime.

It is a super-2 number, since 2×18643701536377² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18643701536347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490623724623 + ... + 490623724660.

It is an arithmetic number, because the mean of its divisors is an integer number (4906237246420).

Almost surely, 2^{18643701536377} is an apocalyptic number.

It is an amenable number.

18643701536377 is a deficient number, since it is larger than the sum of its proper divisors (981247449303).

18643701536377 is an equidigital number, since it uses as much as digits as its factorization.

18643701536377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981247449302.

The product of its (nonzero) digits is 53343360, while the sum is 61.

The spelling of 18643701536377 in words is "eighteen trillion, six hundred forty-three billion, seven hundred one million, five hundred thirty-six thousand, three hundred seventy-seven".