18701966860897 has 4 divisors (see below), whose sum is σ = 18784354380336. Its totient is φ = 18619579341460.

The previous prime is 18701966860877. The next prime is 18701966861027. The reversal of 18701966860897 is 79806866910781.

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 18701966860897 - 2²³ = 18701958472289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18701966860807) 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, 41193759379 + ... + 41193759832.

It is an arithmetic number, because the mean of its divisors is an integer number (4696088595084).

Almost surely, 2^{18701966860897} is an apocalyptic number.

It is an amenable number.

18701966860897 is a deficient number, since it is larger than the sum of its proper divisors (82387519439).

18701966860897 is an equidigital number, since it uses as much as digits as its factorization.

18701966860897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82387519438.

The product of its (nonzero) digits is 438939648, while the sum is 76.

The spelling of 18701966860897 in words is "eighteen trillion, seven hundred one billion, nine hundred sixty-six million, eight hundred sixty thousand, eight hundred ninety-seven".