163750666489 has 4 divisors (see below), whose sum is σ = 172369122640. Its totient is φ = 155132210340.

The previous prime is 163750666487. The next prime is 163750666507. The reversal of 163750666489 is 984666057361.

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 163750666489 - 2¹ = 163750666487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163750666487) 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, 4309228047 + ... + 4309228084.

It is an arithmetic number, because the mean of its divisors is an integer number (43092280660).

Almost surely, 2^163750666489 is an apocalyptic number.

163750666489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

163750666489 is a deficient number, since it is larger than the sum of its proper divisors (8618456151).

163750666489 is an equidigital number, since it uses as much as digits as its factorization.

163750666489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8618456150.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 163750666489 in words is "one hundred sixty-three billion, seven hundred fifty million, six hundred sixty-six thousand, four hundred eighty-nine".