163665390418 has 4 divisors (see below), whose sum is σ = 245498085630. Its totient is φ = 81832695208.

The previous prime is 163665390409. The next prime is 163665390467. The reversal of 163665390418 is 814093566361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 144022527009 + 19642863409 = 379503^2 + 140153^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40916347603 + ... + 40916347606.

Almost surely, 2^163665390418 is an apocalyptic number.

163665390418 is a deficient number, since it is larger than the sum of its proper divisors (81832695212).

163665390418 is an equidigital number, since it uses as much as digits as its factorization.

163665390418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81832695211.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 163665390418 in words is "one hundred sixty-three billion, six hundred sixty-five million, three hundred ninety thousand, four hundred eighteen".