16351979251 has 4 divisors (see below), whose sum is σ = 16352243712. Its totient is φ = 16351714792.

The previous prime is 16351979249. The next prime is 16351979309. The reversal of 16351979251 is 15297915361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15297915361 = 2393 ⋅6392777.

It is a cyclic number.

It is not a de Polignac number, because 16351979251 - 2¹ = 16351979249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16351979195 and 16351979204.

It is not an unprimeable number, because it can be changed into a prime (16351979221) 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, 15630 + ... + 181516.

It is an arithmetic number, because the mean of its divisors is an integer number (4088060928).

Almost surely, 2^16351979251 is an apocalyptic number.

16351979251 is a deficient number, since it is larger than the sum of its proper divisors (264461).

16351979251 is an equidigital number, since it uses as much as digits as its factorization.

16351979251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264460.

The product of its digits is 510300, while the sum is 49.

The spelling of 16351979251 in words is "sixteen billion, three hundred fifty-one million, nine hundred seventy-nine thousand, two hundred fifty-one".