16239351994 has 4 divisors (see below), whose sum is σ = 24359027994. Its totient is φ = 8119675996.

The previous prime is 16239351979. The next prime is 16239352027. The reversal of 16239351994 is 49915393261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49915393261 = 683 ⋅73082567.

It can be written as a sum of positive squares in only one way, i.e., 12736251025 + 3503100969 = 112855^2 + 59187^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4059837997 + ... + 4059838000.

Almost surely, 2^16239351994 is an apocalyptic number.

16239351994 is a deficient number, since it is larger than the sum of its proper divisors (8119676000).

16239351994 is an equidigital number, since it uses as much as digits as its factorization.

16239351994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8119675999.

The product of its digits is 1574640, while the sum is 52.

The spelling of 16239351994 in words is "sixteen billion, two hundred thirty-nine million, three hundred fifty-one thousand, nine hundred ninety-four".