16400253871 has 4 divisors (see below), whose sum is σ = 16498459152. Its totient is φ = 16302048592.

The previous prime is 16400253869. The next prime is 16400253887. The reversal of 16400253871 is 17835200461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17835200461 = 13 ⋅1371938497.

It is a cyclic number.

It is not a de Polignac number, because 16400253871 - 2¹ = 16400253869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16400253871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400263871) 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, 49102390 + ... + 49102723.

It is an arithmetic number, because the mean of its divisors is an integer number (4124614788).

Almost surely, 2^16400253871 is an apocalyptic number.

16400253871 is a deficient number, since it is larger than the sum of its proper divisors (98205281).

16400253871 is an equidigital number, since it uses as much as digits as its factorization.

16400253871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98205280.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 16400253871 in words is "sixteen billion, four hundred million, two hundred fifty-three thousand, eight hundred seventy-one".